| 摘要 |
PURPOSE:To obtain the welding bead of high quality by making the distance between the electrode tips at the final side among plural electrodes arranged at the upper part of a butt part, the total welding current given to the plural electrodes and the welding current given to the final electrode within the range satisfying the specified inequality respectively. CONSTITUTION:The strip plate consisting of titanium or titanium alloy is made a tubular body and the pipe is made with TIG welding by the plural nonconsumable electrodes arranging the butt part in the longitudinal of the tubular body. In this case, the distance L between the tips of two electrodes at the final side among plural electrodes is made within the range satisfying inequalities I, II and the total welding current It give to the plural electrodes is made within the range satisfying the inequality III. And the welding current If given to the final electrode among the plural electrodes is made within the range satisfying the inequality IV. Whereas, L: distance mm between tips of electrode, V: pipe making speed mm/min, T: pipe thickness mm, It: total welding current A, If: welding current A of final electrode, Im: mean welding current per each electrode.
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