In a resistance butt welding process, the workpieces which are to be joined are placed end to end between two clamps and required pressure is applied (Figure 20.46). The high resistance at the joint generates heat on supplying high current and causes fusion to take place at the interface. The pressure applied ranges from 15 to 55 MP. The ends of two pieces are slightly upset and hence term upset welding. In this process, cross-section areas of workpieces used are same. The current density used is 2,000–5,000 A/in.2.
Figure 20.46 Resistance Butt Welding
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