Welding process of workpiece e.g. pipe, involves introducing electric current from welding tool to workpiece after making contact between immersed agitation point of welding tool and plasticized material of workpiece

摘要

The material of workpieces (1,2,11,12) is plasticized. The plasticized material is arranged on a welding tool (3,13). The immersed agitation point (6,16) of welding tool is moved relative to the workpiece such that immersed agitation point is made of tungsten or tungsten alloy. The electric current is introduced from welding tool to workpiece after making rotary contact between immersed agitation point of welding tool and plasticized material of workpiece such that heat is applied on plasticized material of workpiece at predominant extent. An independent claim is included for welding jig.