プラズマ切断部の大電流 MIG+2SAW 法による片面溶接法について

概要

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One side automatic welding by MIG+2SAW process on butt joint cut by oxygen plasma arc was studied in order to improve the sound weld metal and the welding efficiency. (1) The nitrogen and oxygen are concentrated in the plate edge cut by air plasma arc. The oxygen is concentrated but the nitrogen is not concentrated in it cut by oxygen plasma arc. One side & one run welding on butt joint cut by air plasma arc is apt to occur the blowhole, while the welding on it cut by oxygen plasma is superior to that by air plasma for the blowhole. (2) High current MIG+2SAW process is superior to 2SAW for the susceptibility of hot cracking when one side & one run welding is applied on butt joint because a bead geometry is good and the heat input is dispersed between MIG and 2SAW torches. This MIG+2SAW process can prevent a burnthrough and give a good reverse side bead and a good mechanical property to weld metal as well. (3) Oxygen plasma arc can improve the cutting speed compared with air plasma arc. High current MIG+2SAW process increases the traveling speed about 1.5 times than 2SAW. As a result the combination of oxygen plasma arc cutting and MIG+2SAW process improves the efficiency of one side automatic welding.
社団法人溶接学会の論文
1982-01-05