| 摘要 |
PURPOSE:To make pre-processing work easily and efficiently by utilizing TIG or plasma arc for pre-processing of weld joint (groove) such as cleaning, preheating etc. CONSTITUTION:Base metals 1, 1 having proper groove shape are butted at required root opening. A tungsten electrode 3 of a TIG torch 2 is positioned at the weld zone, and inactive gas such as Ar, He etc. is spouted as shield gas 5. Then, the base metals 1, 1 are made electrode of one side, and current is applied to generate an arc. Intensity and size of generated arc 6 are adjusted easily by applied current, voltage etc., and can be used in a wide range provided that grooves of the base metals 1, 1 are not molten. By heat treating above-mentioned grooves, necessary minimum removal of moisture, burning and removal of organic matters such as paint, anticorrosives etc. can be made in a short time when TIG arc welding the root of grooves in the next process. Preheating of the groove part is made at the same time. |
