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Spot welding of different metals-Stainless steel
Stainless steel is having lower thermal conductivity compared to mild steel. Therefore, it requires less heat input. But, stainless steel losses about 50 % its tensile strength if heated above 700 - 800 °C and if it is maintained at this temperature for more than an extremely short duration, this material losses its corrosion resisting properties. From these factors, the following requirements can be derived for spot welding of stainless steels:
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