On Underwater Submerged-Arc Welding (The 2nd Report) : Welding of SM41 steel and SM50 steel Using Flux Cored Wire

概要

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The feasibility of underwater submerged arc welding using flux cored wire was studied. Flux cored wires for CO_2 arc welding of 1.6 and 2.0 mm in diameter were used. The fused flux MF43 mixed with 40 wt% water glass No. 3 was used as shielding material. Base metals were SM41 steel plate and SM50 steel plate. And butt welds were made. In conclusion the feasibility of this process was ascertained. Main results are summarized as follows : (1) Welding arc can be kept stable by using flux cored wire, and a good weld is obtained free from defects, such as blowhole, underbead crack and so on. (2) The weld made by this process has sufficiently high tensile strength, bend ductility and notch toughness. (3) Maximum hardness of the heat-affected zone of underwater weld is about Hv 280. A severe hardening cannot occur in underwater welding by this process. (4) Cooling rate of weld is considerably low. For instance, cooling rate at 500℃ at bond line is 13-15℃/s, which is extremely low as compared with those by the other processes.
社団法人溶接学会の論文
1980-04-01