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What is the principle and essence of resistance welding?
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What is the principle and essence of resistance welding?
Release time:2022.06.10
Summary of information:
Resistance welding includes: spot welding, butt welding, projection welding, and seam welding. Its principle is: place two metal workpieces between electrodes, press them tightly and then energize them. The current flows through the welding area and then uses the resistance heat of the workpiece itself to heat the workpiece, so that the welded part reaches a local melting or high-temperature plastic state.
Butt welding principle
Resistance welding includes: spot welding,Butt welding, projection welding, seam welding
Its principle is: Put two metal workpieces between electrodes, press them tightly and then energize them. The current flows through the welding area and then uses the resistance heat of the workpiece itself to heat the workpiece, so that the welding area reaches a local melting or high-temperature plastic state, and then uses mechanical force to form a metal bond.
its essence: Utilize the resistance heat of the metal itself in the welding area and a large amount of plastic deformation energy to bring the metal atoms on the two separated surfaces close to the lattice distance to form a metal bond, and generate a sufficient amount of common grains on the bonding surface to obtain welding spots, welds or butt joints.
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, row welding machine network Sheet 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 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 row welding machine, ton barrel frame 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 types. If you are interested in our welding equipment, please contact us.
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Butt welding of aluminum alloy
Summary of information:
Common butt welding methods for aluminum alloys include spot welding and butt welding. The 3457 series butt welding is easier and can be done with a resistance AC butt welding machine. The added elements in the 126 series are not resistance weldable. For spot welding in touch welding, no matter which series it is, it is more difficult. The thicker the plate, the more difficult it is to weld. The reasons are: 1. Electrical conductivity and thermal conductivity
Common butt welding methods for aluminum alloys include spot welding and butt welding. The 3457 series butt welding is easier and can be done with a resistance AC butt welding machine. The added elements in the 126 series are not resistance weldable.
For spot welding in touch welding, no matter which series it is, it is more difficult. The thicker the plate, the more difficult it is to weld. The reasons are:
1. The electrical conductivity and thermal conductivity are high but the resistivity is low. It is difficult to generate heat but dissipate heat quickly. It requires a high-power welding machine, which is 3-5 times greater than that of low carbon steel.
2. The plastic temperature range is small and the forging deformation is difficult.
3. The large heat-affected zone creates a wide area that is easy to soften.
4. An oxide film is easily formed on the surface to hinder the passage of current.
5. Poor stability, welding temperature and holding temperature cannot be guaranteed, making it difficult to form weld nuggets
6. Current shunts quickly and cracks are easily formed.
Therefore, the following points should be paid attention to when spot welding:
1. Use large current and short time, usually 32-45KA current and 0.1 second for spot welding.
2. There are many choices for aluminum alloy thin plates, including time-controlled and microcomputer-controlled spot welding machines that can accurately set time and current, such as hand-held spot welding machines, foot-operated spot welding machines and pneumatic spot welding machines; for thick plates, medium-frequency spot welding machines should be used.
3. Large-diameter flat or spherical electrodes made of dispersed copper should be selected.
4. The electrode should have good followability and the pressure should be 500-700KG.
5. The cooling water flow rate should be twice that of other materials.
6. The controller must have a slow-rising function to suppress splashing.
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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