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Spot weldingButt weldingThe solder joints at the time have clear requirements on some materials, such as size, penetration rate, etc. If there is deviation, it does not meet the standards. There are four solutions. Let’s take a look with the editor of Xinxing
1.How big should the nugget be? What is the welding penetration rate?
Nugget diameter d=3.5~5 times δ1/2 or d=2t+3, some have clear size requirements, as shown in the table
Welding penetration rate is 50%-70%
2. Reasons for solder joint offset results The nugget is not symmetrical with the bonding surface, but is biased toward the thicker plate or the side with poor electrical and thermal conductivity. The result is that the nugget on one side is small in size, has low welding penetration, and has poor load-bearing capacity.
3. Reasons for solder joint offset The solder joint offset is caused by the imbalance of heat dissipation and heat dissipation between the two workpieces during the heating process. The nugget shifts toward the side with greater heat and slower heat dissipation. For example, 1. Overlap spot welding of 2 workpieces with different thicknesses. 2. Spot weld two workpieces of the same thickness but different materials.
4. Solution to solder joint offset
1. Use high current for short time to weld 2. Use electrodes of different diameters or materials 3. When using a DC welding machine, the DC produces the Peltier effect, which causes the temperature of the two electrode working surfaces to be different. 4. Add process gaskets to the thin plate layer, usually.2-0.3mm metal gaskets. For example, add stainless steel gaskets when spot welding copper or aluminum alloys, add low carbon steel gaskets when spot welding brass, and use molybdenum gaskets for gold strip spot welding machines.
5. Use up and down adjustable pressure spot welding machine for welding
Wuxi Xinxing Welding Equipment Factory has been engaged in resistance welding for 29 years. Its core technology products include: semi-automatic butt welding machine, pneumatic-flash butt welding machine, multi-strand wire welding machine, foot 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 appliance spot welding machine, copper bar copper tube 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 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., more than 300 kinds. If you are interested in our welding equipment, please contact us.
