Vacuum brazing furnace structure

Vacuum brazing furnace structure

Vacuum brazing furnace is processed workpiece heat treatment of a large equipment, can undertake vacuum annealing, vacuum limitation as well as vacuum brazing and so on heat treatment processing. Vacuum brazing furnace can write a variety of different applications, can also control and write hundreds of curve of heat treatment, its temperature control zone can be roughly divided into before and after the up, down, left, right, and the six partitions, vacuum brazing furnace installation has a single point and multi-point temperature protection device and temperature recorder, and the uniformity of furnace temperature can be controlled in the range of fluctuation of 3 degrees Celsius, in addition, also strong cooling device with high flow, high purity nitrogen. The vacuum brazing furnace has high efficiency and high furnace quantity.
Vacuum brazing furnace is mainly used in aluminum vacuum brazing, titanium alloy, stainless steel, high temperature alloy, hard alloy and nonferrous metal brazing, and die steel, stainless steel, high speed steel and bearing steel materials such as vacuum tempering heat treatment.
Vacuum brazing furnace structure:
Vacuum brazing furnace consists mainly of heating room, vacuum chamber, pump system, control system and heat exchanger. The pump system consists of the maintenance pump, mechanical pump, diffusion pump, and the rotz pump. Valve consists of pneumatic valves such as high valve, front stage valve, maintenance pump valve and by-pass valve. The heating chamber consists of heating chamber shell, heater, reflector, insulation, hearth and electrode.
When the vacuum brazing furnace works, the mechanical pump, the diffusion pump, the pump and the front stage valve, the pump valve, and the pump valve begin to vacuum in the diffusion pump. When the vacuum in a vacuum brazing furnace reaches a certain value, the rotz pump, the bypass valve starts and the front valve closes, and the vacuum chamber is evacuated. When the diffusion pump is heated to the specified temperature, the bypass valve closes, the high valve and the front valve open. The heat treatment process can be carried out after the vacuum chamber is vacuum and the vacuum degree is required.

Brazing technology of classification and what are the advantages?

Brazing technology of classification and what are the advantages?

Brazing is one of the three welding method, including fusion welding, brazing and bonding of the three. Brazing process is mainly to use than the weld metal of low melting point metal solder, and then heated to a temperature higher than the weldment and filler metals solder, below the melting temperature of the weldment, then using liquid solder wetting welding pieces of metal, fill the joint clearance and mutual diffusion and base metal, so as to realize a method of connecting the weldment. So compared with other welding methods, brazing process advantages what?
1, when soldering, solder melts, and weldment won't melt, and the temperature of the welding with the different choice of solder, and at room temperature to nearly large areas of the parent metal melting temperature change inside. In order to avoid the base organizations, as well as the change of the performance, you can choose to brazing filler metals, which have lower melting point and welding is no choice.
2, at the time of brazing, welding is often a whole heating or around the brazing seam for uniform heating of large area, therefore, relative distortion of welding and brazing welding head are much smaller than welding residual stress, it is also to ensure the precision of welding.
3 are heavily dependent on liquid filler metals, brazing seam automatically fill the gap after frozen, so as long as the solder, flux and brazing methods selection of good, can mass or many brazing seam welding at the same time or continuous brazing, productivity is very high. In the process of brazing rarely because of the accessibility of the weld structure, and open sex.
4, because the soldering reaction only in parent material of a few microns and even the following interface to dozens of micrometers, so, generally does not involve the deep structure of parent metal, and therefore, more suitable for dissimilar metal stents, and even nonmetallic and nonmetal, the connection between the metal and nonmetal, it is can't do welding method.
5, brazing seam strength and heat resistance were lower than the base metal, and in order to make up the lack of strength, often by increasing the overlap area to solve the problem, so the braze welding head will be more samples of the lap joint methods to increase the weight of the structure, therefore, is more brazing materials.

Understand the high requirements of the high temperature vacuum furnace

Understand the high requirements of the high temperature vacuum furnace

High temperature vacuum furnace ironmaking automation is designed to make production process optimization, produce stable quality products and improve the process operator working conditions, this requires the technical and economic aspects of productive rationalization measures, in the process of ore smelting discount, physical and chemical changes very difficult to control the difficult measurement.
More and more high mechanization degree of high temperature vacuum furnace, vacuum environment was does not have other forms of sintering (when the furnace vacuum degree is 1.3 * 10-1 PASCAL, remaining in the furnace gas purity argon 99.99987%); Vacuum sintering can make material before a liquid particle oxidation film completely ruled out, so as to change a good wettability of the liquid with carbide phase, to improve the alloy organization structure, improve the performance of alloy. Due to the vacuum press billet pore reduced the amount of gas in steel rolling workshop push by the steel type heating furnace of continuous development to all kinds of stepping type furnace, roller hearth furnace, furnace, chain furnace, etc.
Some within the chamber furnace heating shaped blank in the past, now change in annular furnace heating, productivity had the very big enhancement. The use of the electronic computer, the stove from loading assumed, paragraphs in the furnace temperature control, fuel and air traffic control, automatic control, furnace pressure until the steel material on time and discharging program operation, are given by computer control values, and be able to adopt the optimal control of the furnace condition, on the temperature of the steel material and the temperature difference at very accurately.

How to determine the cooling speed of vacuum brazing furnace parts

How to determine the cooling speed of vacuum brazing furnace parts

Weldment cooling is done at the end of the soldering heat preservation, but the rate of cooling is have effect on the quality of the joint. Cooling speed too slow, may cause the grain growth of parent metal, solder with parent metal interaction time growth, leading to excess of parent metal to dissolve in the solder, produce corrosion defects; To speed up the cooling speed, which is beneficial to refine brazing seam organization, thus improve the joint strength; But cooling speed too fast, may make the welding crack due to excessive internal stress formed, may also be due to the brazing seam rapid solidification doesn't make the gas evolution and formation porosity. Therefore specific to determine the cooling speed, must be combined with weldment size, by synthetically considering all kinds of factors such as parent material types and solder.

Vacuum brazing furnace operation procedures

Vacuum brazing furnace operation procedures

Before a furnace, vacuum furnace and ensure that water, electricity, gas in the assignments. In 380 v voltage, can not have the deviation of 10%. Pressure in 0.6 Mpa, the water pressure to the lowest (0.5 Mpa). Reach the above requirements to electricity, after operation.
Second, before feeding, check the equipment heating chamber, the heating chamber is necessary to clean, can not have sundry, dust, oil, water, etc. In view to put goods, dry cleaning, same before feeding the without watermarks, oil and other washing clean.
Third, after loading, the knob to the "door close" position. Then, a "mechanical pump" and "thick smoke valve". Of vacuum unit and the furnace smoke gas, opened the vacuum furnace with the power supply (general vacuum gauge power to launch with total power supply).
Fourth, when the vacuum degree higher than 1000 pa, vacuum gauge monitoring "J2" light. This time, can open "roots pump. Conditions such as, "roots pump" will not open, click on the button no response.

Removal of vacuum aluminum brazing furnace oil need to pay attention to the problem

Removal of vacuum aluminum brazing furnace oil need to pay attention to the problem

1, to 400 degrees Celsius temperature quickly, in order to reduce the diffusion brazing junction silicon, is helpful to ensure the quality of joints. As this is aluminum brazing process requirements, must do it.
2, then take a slow long natural cooling, this step is to cleanse sandstones from fouling. At this time due to the furnace with nitrogen gas, waste heat by the cycle of nitrogen} L conduction, radiation to heat was less than the adsorption with the cold components of oil pollution. The temperature of these artifacts usually only tens of degrees, in the process can increase to 200 degrees Celsius, so as to achieve its evaporation table and pollution of the day.
3, the next coarse vacuum, one party but would have vaporized oil steam out of furnace chamber, prevent again by adsorption after cooling, the other party and, in the crude oil evaporation under vacuum environment will be more thorough. Diffusion pump no need to open, because when pressure drop to 10 pa, more than 99.99% in furnace gas has been pulled out.
4, closed cooling water of furnace wall, furnace door is to reduce heat loss, is more advantageous to raise the temperature of furnace wall. However, because the diffusion pump need cooling of equipment, can't stop water cycle system.
5, and other issues
Through such processing, baffle plate and oil base on some of the heat capacity of the smaller components can be cleared away. Wall due to the heat capacity, although closed cooling water in advance, but still kept cooling water increase the heat capacity of National People's Congress, the temperature is still rising gao, clean from the effect of oil pollution is the worst. So, in the final need to j ping work cleaning furnace wall. Because the oil is accumulated for a long time, the oil will stick with dust, is can't use this method to remove dust, oil pollution has been removed, the remaining dust adhesion is not strong, can use a vacuum cleaner to clean up, or use the clean compressed air to blow away. Can't clean the furnace wall and the last to do that, and heating evaporation, and there will be some oil vapor by adsorption. When removing dust will be, ash, _ stick. So the wall should be on the final wash clean.

The main technique index of vacuum brazing furnace

The main technique index of vacuum brazing furnace

Vacuum brazing furnace is mainly used to apply in cars, planes, ships, compressors, air separation equipment, carbide, diamond, household appliances, such as all kinds of heat exchanger, oil cooler and a variety of vacuum brazing of the antenna, electronic communication components, application scope is broad, the following is to tell everyone about vacuum brazing furnace equipment main technical indicators:
1, the furnace type: single room, horizontal.
2, the workspace: 900 (L) x 600 (W) x 600 mm (H).
3, charge: 500 kg/furnace (fixture).
4, the highest temperature: 1320 ℃.
5, the ultimate vacuum: 6 x 10-4 pa (empty furnace, cold, the purification).
6, pressure rise rate: < 0.2 Pa/h.
7, temperature uniformity, plus or minus 3 ℃ or less.
8, the temperature control precision: + / - 1 ℃ or less.
9, charging ways: hydraulic forklift.
10, heating power: 150 kw.
11, no-load heating time: from room temperature to 1320 ℃ for 30 minutes or less.
12, the maximum cooling pressure: 2 bar.

The hot wall vacuum brazing furnace type

The hot wall vacuum brazing furnace type

Hot-wall vacuum brazing furnace used than the parent metal of low melting point metal materials as solder, use liquid solder wetting fill material and workpiece interface gap and make it with the parent metal diffusion welding method. Suitable for welding precision, complex, and composed of different materials.
According to different welding temperature, the hot wall vacuum brazing furnace can be divided into two broad categories. Welding heating temperature below 450 ℃ is called soft soldering, higher than 450 ℃ is called the brazing. Soft soldering used in electronic and food industries more conductive, airtight and watertight devices of welding. In a tin lead alloys as solder tin welding is the most commonly used. Soft solder generally need to use solder, to remove oxide film, and can improve the wettability of solder. Flux is a lot of more phyletic, the electronic industrial use of rosin alcohol solution soft soldering. The solder residue after welding workpiece non-corrosive effect, called no corrosive soldering flux. Welding flux used in materials such as copper, iron, the zinc chloride, ammonium chloride and vaseline, etc. The need when welding aluminum with fluoride and fluorine boric acid salt as flux, and hydrochloric acid and zinc chloride as flux, etc. The solder residue after welding have corrosion effect, called the corrosive soldering flux, must be cleaned after welding.
Braze welding head high strength, can work under high temperature. There is a wide variety of brazing filler metals, aluminum, silver, copper, manganese and nickel as the base of the most widely used solder. Aluminum solder used in aluminum brazing. Silver base, copper base filler metals are often used for brazing of copper, iron parts. Manganese and nickel based solder used to weld more working under high temperature, such as stainless steel, heat-resistant steel and high temperature alloy parts. Welding of beryllium, titanium, zirconium and other refractory metals, graphite and ceramic materials are commonly used palladium base, zirconium and titanium based solder, etc. The characteristics of the parent metal and should consider when choose solder joint performance requirements. Brazing flux are usually made of alkali and heavy metal chloride and fluoride, or borax, boric acid and fluoboric acid salt, etc, can be made into powder, paste and liquid. Join in some solder lithium, boron, phosphorus, to enhance its ability to remove the oxide film and wetting. After welding flux residue rinse off with warm water, citric acid or oxalic acid.

The use of vacuum brazing furnace in good condition

The use of vacuum brazing furnace in good condition

Using gas, liquid hydrogen through outdoor of finned tube evaporator liquid tank evaporation, and concession road into large indoor air tank, in the furnace need to provide a large number of gas during the forced air cooling. Although gas supply manufacturers in the liquefied gas tanker exit gas purity of 9.998%, but according to the requirements of technical conditions should be checked at the entrance of each furnace gas dew point.
Asked dew point average for a 65 "F (18 ℃). Every six months a leak test should be made for the whole system to the root to the end, the vacuum brazing furnace running just is the result of users continuously maintained. In today's world, success is only a compromise between the gain and loss and efficiency. Users are concerned about the vacuum brazing furnace good used condition.

Vacuum brazing technology advantage is introduced

Vacuum brazing technology advantage is introduced

Vacuum brazing technology since 40 s, has become a very promising welding technology. First appeared in the electronics industry in the brazing of copper and stainless steel parts, and then applied to the aviation industry, nuclear industry, started in 1959 is applied to the manufacture of stainless steel plate-fin heat exchanger. Now, they are widely used in air separation equipment, petrochemical equipment, engineering machinery, cars, boats and home appliance industries of plate-fin heat exchanger and cooler.
Because the vacuum brazing technology has incomparable advantages, so in the developed countries in the world get rapid development and wide application. Its advantages are as follows:
1. Vacuum brazing, because no soldering flux, significantly improve the corrosion resistance of the product, from all kinds of pollution, pollution-free processing equipment, has a good safety conditions;
2. The vacuum brazing not only save a lot of expensive metal soldering flux, and without complex flux of the cleaning process, reducing the production cost;
3. The wettability of vacuum brazing filler metals and liquidity is good, can weld more complex and narrow channel device, vacuum brazing improve the yield of the product, get strong clean face;
4. Compared with other methods, the internal structure of the furnace and fixtures such as long life, can reduce the maintenance cost of the furnace.
5. A lot of material is suitable for vacuum brazing, such as: aluminum, aluminum alloy, copper, copper alloy, stainless steel, alloy steel, mild steel, titanium, nickel, nickel by kang (Inconei) can travel through a vacuum brazing furnace, the designer according to soldering device USES to determine the required materials, including aluminum and aluminum alloy applied most widely.

Vacuum brazing performance of the unit

Vacuum brazing performance of the unit

Vacuum brazing furnace brazing furnace to maintain excellent soldering quality depends on the performance of the vacuum brazing furnace maple group vacuum brazing furnace pump often need to pay attention to don't think that you never turn it off, it will run forever. "If the vacuum brazing furnace maintenance crew at the time, on weekends and holidays shutdown, more economical to do so. Otherwise, if still idling at the weekend, mechanical pump will be stuck and difficult to start again. Our experiment results show that the average winter set in 28 degrees, set in 26 degrees in summer. With this method can save a lot of electricity. Due to the lack of water or overheating: temperature 140. ~ 150. F the above 60 ~ 66 ℃), easy to cause mechanical pump overheating, and noises. Available portable device on a weekly basis to pump vacuum brazing furnace oil filter, check the oil level and take the sample, check the oil quality by feeling and appearance.
A few years ago, we have found that the mechanical pump use high quality oil is more economic. The cost of high quality oil is generally more than three times of industrial oil, and keep the pump clean time is five times the sustainable. A valve should be replaced every three months and spring. Stainless steel spring longer diffusion pump should be removed once a year, to overhaul, including all the cleaning. After the diffusion pump oil contaminated can't vacuum soldering furnace So should check the quality of the oil level and oil once a week. Best high quality silicon oil, such as SW1 - ZKY or a brand. Practice shows that using this oil can keep the degree of vacuum brazing furnace in 10 ~ l0 3-5 torr range, brazing production quite satisfied. Replace the oil can be recycled, the price about 70 yuan, every kilograms and new oil 220 yuan per kilogram.

The advantages of vacuum brazing

The advantages of vacuum brazing

1. Vacuum brazing, because no soldering flux, significantly improve the corrosion resistance of the product, from all kinds of pollution, pollution-free processing equipment, has a good safety conditions;
2. The vacuum brazing not only save a lot of expensive metal soldering flux, and without complex flux of the cleaning process, reducing the production cost;
3. The wettability of vacuum brazing filler metals and liquidity is good, can weld more complex and narrow channel device, vacuum brazing improve the yield of the product, get strong clean face;
4. Compared with other methods, the internal structure of the furnace and fixtures such as long life, can reduce the maintenance cost of the furnace.
5. A lot of material is suitable for vacuum brazing, such as: aluminum, aluminum alloy, copper, copper alloy, stainless steel, alloy steel, mild steel, titanium, nickel, nickel by kang (Inconei) can travel through a vacuum brazing furnace, the designer according to soldering device USES to determine the required materials, including aluminum and aluminum alloy applied most widely.

The product use characteristics of vacuum brazing furnace

The product use characteristics of vacuum brazing furnace

Vacuum brazing furnace product use: mainly used for stainless steel heat exchanger, oil cooler, stainless steel vacuum cup, vacuum brazing technology features: continuous vacuum brazing furnace USES: mainly used for all kinds of brazing products mass production of 1, using zoning heater layout, make the heating zone temperature uniformity is consistent; 2, vacuum atmosphere brazing, artifacts can be maintained clean and bright; Continuous vacuum brazing furnace characteristics: 1, the use of advanced technology; 2, safe and reliable control system; 3, the beat or continuous artifact move way; 4, can be adjusted for the processing chamber for process.

Maintenance of vacuum brazing furnace

Maintenance of vacuum brazing furnace

Continuously operating on a daily basis - with no filler metal with vacuum brazing furnace to various parts of the vacuum brazing furnace, inevitably lead to some vacuum brazing furnace charge fly all the damage to the heating elements and heat shield. If not timely maintenance, vacuum brazing furnace metal deposition, will soon be corrosion damage to the heating element, or produce local overheating, or make the heating system is broken one or more of the phase. That leads to the temperature of the inhomogeneity, in batch vacuum brazing furnace production, this kind of situation is often not noticed. Heating element of repair is the easy, it is not the same as heat insulation screen damage.
If heat insulation screen USES the key persons, as long as the screen with a thin layer of ink stone protection can make the vacuum brazing furnace metal splash damage down to the most. Vacuum brazing furnace metal and graphite surface wetting and bonding, not simply in the form of beads drops roll to the cold of the furnace area. After completion of these particles in a vacuum brazing furnace, also not harm can easily be removed.

Simple understanding of vacuum brazing furnace

Simple understanding of vacuum brazing furnace

Everyone's understanding of vacuum brazing furnace how many? In order to make people more about the product master, we'll give you a brief introduction of below!
Vacuum brazing furnace is the large-scale equipment, heat treatment can be vacuum brazing, vacuum annealing, vacuum aging and other processing. Programmable multiple different procedures, it can control and into hundreds of heat treatment curve points, six points up, down, left and right sides, front and rear area temperature control, there are more and single point temperature recorder and over temperature protection device,  vacuum furnace temperature uniformity can be controlled in less than 3 ℃, the other with the installation of high purity nitrogen high flow of strong cold. The equipment has a large amount of furnace charging and high efficiency, have special request for complex parts and parts no need for supplementary processing products.

Vacuum Brazing for Tungsten Carbide and Cobalt Titanium 40Cr Steel

Vacuum Brazing for Tungsten Carbide and Cobalt Titanium 40Cr Steel

Cobalt tungsten titanium carbide and carbon steel 40Cr vacuum brazing welded. Vacuum brazing method is suitable for mass production of carbide cutting tools and drilling of carbide drills and the like.
Once heated to complete multiple blade brazing of carbide cutting tools, we have a higher efficiency of brazing. Most carbide tools welding methods previously embedded in the carbon steel or low alloy steel substrate use is closely related to the use of performance cemented carbide welding process, the welding performance has a direct impact on the use of carbide effect. When vacuum brazing tungsten carbide cobalt titanium, welding residual stress must be minimized. Measures must be taken to reduce the braze welding stress can be taken to reduce brazing temperature, preheat and slow cooling, use plastic good solder, plus compensation pads, and other measures to improve the joint structure. When a large area of hard alloy brazing, regardless of intensity, should take special measures to reduce welding stress and prevent cracks.

Vacuum Brazing Furnace Hot Zone Temperature Control Partition

Vacuum Brazing Furnace Hot Zone Temperature Control Partition

In the heating chamber vacuum brazing furnace to form a magnesium-containing atmosphere to protect the exposed aluminum surface is no longer oxidation. On the other hand penetrate through an alumina film slit aluminum surface, forming alloy partially melted, further tunneling oxide film. Produce liquid solder wetting and flow on non-fresh surface oxide film, and filled weld formed under the action of capillary forces the fillet. Aluminum vacuum brazing must be seen in a high vacuum state by the above description, generally in 10-3Pa magnitude. If the vacuum of less than 10-3Pa, then immediately combined with magnesium and evaporated vacuum brazing furnace, oxygen and moisture paper trace of the child, can not form a magnesium protective atmosphere, so just exposed to the fresh aluminum oxide surface and immediately, if not removing the oxide film, it will not cause liquid solder wetting and flow. For the radiator, the radiator due to the relatively large surface area, the amount of gas adsorbed lot, in the heating process will be a lot of deflation, the vacuum was reduced. To Yasumasa vacuum brazing furnace, vacuum, and therefore must choose a larger pumping speed of the vacuum unit (pump rate: 5.0 × 10-4Pa atmosphere to no more than 30min) Al-Si-Mg solder melting point close to the melting point of aluminum , so its brazing temperature range is very narrow, generally between 595 ~ 615 ℃. As for the heat exchanger type structure is generally large size and spatial distribution are very uneven and mostly thin-walled material, and therefore requires uniformity of temperature vacuum furnace heating zone is very strict, not more than ± 3 ℃ (space heaters, nine temperature), so the need for vacuum brazing furnace hot zone temperature control partition. Rain increase 200 ℃ oven. Incubated for 60 minutes. Vacuum below 5 * 10-2.

High temperature vacuum brazing furnace

High temperature vacuum brazing furnace

High temperature vacuum brazing furnace is used in copper alloy, stainless steel, high temperature alloy, heat resistance alloy vacuum brazing process, also it is used in refractory alloys and dissimilar metals which contain Ti, Zr, niobium, Mo elements vacuum brazing process. It is widely used in EGR cooler, diamond cutting tool, Fe-Cr-Al alloy, plate-fin heat exchangers, oil cooler brazing process.
During brazing process, work pieces under vacuum atmosphere or protection atmosphere condition, this process can achieve no oxidation, tiny deformation, no air hole, no flux slag, bright surface, no pollution advantages.
The control system was controlled by PLC; temperature was controlled by intelligent temp controller, accurate control, and high automation. User can choose auto or manual undisturbed switching to operate it; this furnace has abnormal condition alarming function, easy to operate.

Vacuum brazing furnace safety rules

Vacuum brazing furnace safety rules

You know the safety rules vacuum brazing furnace, what are you? We must be mastered in order to work in a vacuum brazing furnace before the operation of its security procedures, so as not to affect the course of work. With a look!
1. Before using this device, you should be familiar with equipment operating instructions and temperature indication regulator, in order to achieve the purpose of the proper use of various instruments.
2, ammonia is a toxic gas odor stimulus, should prevent leakage, non-human direct contact with liquid ammonia, to avoid frostbite.
3, always check the device's pneumatic system tightness, ammonia leak irritating odor, and decomposition gas is colorless and odorless, but explosive, pay attention to safety.
4, antifreeze splash operatives wearing masks and gloves when replacing ammonia bottle.
5, open intake must be slow when ammonia valve to prevent a large number of liquid ammonia into the device and into the ammonia pressure can not be controlled.
6, non-operatives are free to modify the parameters temperature control instrumentation.
7, the device should be checked before power cooling water is smooth.
8, prohibited operatives directly with hydrogen to discharge air inside the muffle.
9, prohibited the feeding stage ignition mouth shut.
10, the device temperature, when cooled, in strict accordance with heating, cooling curve execution.
11, the operator at the time of welders, the workpiece should be placed on the transfer belt in the middle.
12, the apparatus is in use, is strictly prohibited open on both sides of the furnace cover plate.
13, equipment operation, if an alarm occurs should be viewed troubleshooting.
14, non-smoking in the workplace. Working around the venue should the fire ban, Waterproof area with fire extinguishers.
15, prohibited device directly facing the operator unloading port work.
16. The equipment enclosure must be grounded to avoid electrical accidents.
17, the device cut off the power during maintenance overhaul.
18, decomposing furnace in the heating process, must not exceed 850 ℃, the event should be promptly cut off the power supply to avoid stove burned.
19, must be inserted into the bottom of the dryer temperature thermocouple tube to prevent over-temperature thermal burn out of control equipment.
20, if the analyzer displays accurate system is working properly, but the products reach the index, it can be considered a catalyst, whether molecular sieve has expired. Catalyst, molecular sieve life of more than 2 to 3 years. If the confirmation has expired, you need to replace the catalyst, molecular sieve, which must have professional and technical personnel.

Vacuum Brazing Welding Equipment Fixture Design

            Vacuum brazing fixture and general design principles

Brazing parts shall be assembled in positioning vacuum brazing, the parts of the question in order to ensure mutual position and brazed joints required to ask gap. Brazing the brazing jig involves fixing parts, assembly, into the furnace, brazing, baked whole process. Jig is reasonable and practical directly affect the quality of brazing. Common fixture design principles and requirements also apply to brazing fixture design, such as the fixture system to have a certain precision; fixture system to have a certain rigidity to overcome the deformation process; fixture system to be compact, simple shapes, handling and convenient features in addition to considering the above principles, brazing fixtures as well as its own characteristics, generally speaking brazing fixture design should also consider the following factors:
(1) the clamp material to be able to withstand the brazing temperature, without loss of strength , deformation and release gas, difficult to produce an alloy react with welding pieces;
(2) pay attention to fixtures and parts of thermal expansion and contraction, at the brazing temperature, to ensure the braze parts with suitable joint gap; and
(3) the clamp To ensure heat conduction soldering zone due to heat transfer on the stability of the heated components interfere with the minimum cooling, and without prejudice to the flow of the solder.