| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a welding method applicable to two sheets or more, desirably, three sheets or more of laminate metal plates.SOLUTION: A plasma jet 36 generated by a plasma torch 30 is applied to a fourth metal plate 24 as indicated in Fig.(a). The plasma jet 36 becomes an extent-small flow by the orifice action of thermal pinch force of plasma gas 34 while being squeezed by a nozzle 32. Since the plasma jet 36 is the extremely high temperature, the fourth metal plate 24 and a third metal plate 23 are locally melted as indicated in Fig.(b). Molten metal 37 is generated. The plasma jet 36 further reaches a first metal plate 21 of the lowest layer as indicated in Fig.(c), and the first metal plate 21 is also locally melted. Injection of the plasma jet 36 is stopped at this time. The molten metal 37 is coagulated, and weld metal 38 is formed as indicated in Fig.(d). Spot welding of three sheets or more of laminate metal plates can be executed.</p> |
