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If you want to do flash butt welding well, you need to know these metal common sense
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If you want to do flash butt welding well, you need to know these metal common sense
Release time:2022.06.09
Summary of information:
Theoretically, almost all steel and non-ferrous metals can be flash butt welded, but to obtain high-quality joints, Xinxing Welding recommends taking necessary process measures based on the relevant characteristics of the metal.
Theoretically, almost all steel and non-ferrous metals areflash butt welding, but to obtain high-quality joints, Xinxing Welding recommends based on the relevant characteristics of the metal,Take necessary process measures.
(1) Electrical and thermal conductivity
For metals with good electrical and thermal conductivity, shorter welding time, larger power and faster flash speed should be used.
(2)High temperature strength
For metals with high temperature and strength, the width of the plastic zone should be increased and a larger upsetting force should be used.
(3) Crystallization temperature range,
The larger the crystallization temperature zone and the wider the semi-melted zone, the larger the upsetting pressure and upsetting allowance should be used to squeeze out all the molten metal in the semi-melted zone to avoid defects such as shrinkage cavities, looseness and cracks left in the joint.
(4) Thermal sensitivity
There are two common situations. The first is quenched steel. After welding, the joint is prone to quenching structure, which increases the hardness and reduces the plasticity. In severe cases, quenching cracks will occur. Quenched steel usually uses preheated flash butt welding with a wide heating zone, and measures such as slow cooling and tempering are used after welding. The second type is metals that have been strengthened by cold work (such as austenitic stainless steel). During welding, the joints and heat-affected zones soften, reducing the strength of the joints. Welding such metals usually uses faster flash speeds and larger upsetting pressures to minimize the softening zone and reduce the degree of softening.
(5) Oxidizing property
Oxide inclusions in joints have serious harm to joint quality. Therefore, preventing and eliminating oxidation is the key to improving joint quality. The composition of metals is different, and the generation of their oxidation properties is also different. If the melting point of the generated oxide is lower than that of the metal to be welded, the oxide will have better fluidity and will be easily expelled during upsetting. If the melting point of the generated oxides is higher than that of the metal to be welded, such as silicon 02, Al203, Cr203, etc., they must be discharged when the metal to be welded is still in a molten state. Therefore, when welding alloy steel containing more silicon, aluminum, chromium, and other elements, strict process measures should be taken to completely eliminate
Remove oxides.
Wuxi Xinxing Welding Equipment Factory has been engaged in resistance welding machines for 29 years. Its core technical products include: semi-automatic butt welding machine, pneumatic-flash butt welding machine, multi-strand wire welding machine, foot pedal spot welding machine, pneumatic spot welding machine, medium frequency spot welding machine Machine, row welding machine mesh welding machine, resistance automatic welding machine, energy storage welding machine, copper rod aluminum rod disc circular welding machine, auto parts spot welding machine, sheet metal parts spot welding machine, home appliance hardware spot welding machine, small electrical appliance spot welding machine, copper row copper pipe welding machine,Nut spot welding machine, stainless steel welding machine, foil strip spot welding machine, aluminum spot welding machine, multi-head spot welding machine, bag cage spot welding machine, mesh welding machine, ton rack welding production line, resistance automatic welding machine, brazing machine, diffusion welding machine, projection welding machine, seam welding machine, wire and cable optical cable supporting equipment, etc., reaching more than 300 kinds. If you are interested in our welding equipment, please contact us.
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Butt welding of copper and copper alloys
Summary of information:
The butt welding of copper and copper alloys is better than that of aluminum alloys. The most commonly used ones are spot welding and butt welding. Resistance AC butt welding machines are generally used for butt welding. Spot welding is easy for thin copper parts but difficult for thick parts. Unlike aluminum alloys, thick plates cannot be welded with medium frequency spot welders, but resistance brazing or welding.
The butt welding of copper and copper alloys is better than that of aluminum alloys. The most commonly used ones are spot welding and butt welding. Resistance AC butt welding machines are generally used for butt welding. Spot welding is easy for thin copper parts but difficult for thick parts. Unlike aluminum alloys, thick plates cannot be welded with medium frequency spot welders, but must be welded by resistance brazing or welding.
Let’s talk about spot welding first. Why is spot welding difficult?
Copper alloy has good electrical and thermal conductivity, high resistivity, rapid heat generation and heat dissipation, and difficult plastic deformation.
Therefore, attention should be paid to spot welding copper alloy:
1. Thickness should be less than 1.5mm
2. Thin plates with a thickness of less than 0.2mm can be welded with a special foot-operated spot welder for copper strips.
3. 0.2~1.5mm is welded by pneumatic spot welding machine or medium frequency spot welding machine.
4. The electrode should be made of tungsten or molybdenum material
5. In order to prevent spatter and shunting, the spot distance and overlap amount should be increased during spot welding.
Wuxi Xinxing Welding Equipment Factory has been engaged in resistance welding for 29 years. Its core technical products include: semi-automatic butt welding machine, pneumatic-flash butt welding machine, multi-strand wire welding machine, foot pedal spot welding machine, pneumatic spot welding machine, medium frequency spot welding machine, row welding machine mesh welding machine, resistance automatic welding machine, energy storage welding machine, copper rod and aluminum rod disc circular welding machine, auto parts spot welding machine, sheet metal spot welding machine, home appliance hardware spot welding machine, small electrical appliances There are more than 300 types of spot welding machines, copper bar copper tube welding machines, nut spot welding machines, stainless steel welding machines, foil strip spot welding machines, aluminum spot welding machines, multi-head spot welding machines, bag cage spot welding machines, mesh welding machines, ton rack welding production lines, automatic resistance welding machines, brazing machines, diffusion welding machines, projection welding machines, seam welding machines, wire and cable optical cable supporting equipment, etc. If you are interested in our welding equipment, please contact us.
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