水中における重力式パルスアーク溶接

概要

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Underwater welding by gravity pulsed arc welding process and welding phenomena were investigated by using coated electrodes of three types. Main results obtained are summarized as follows : (1) When cycle time t_<ps> is approximately equal to duration of metal droplet transfer in steady current and average current I_<αυ> equal to steady welding current I_d, one pulse-one droplet transfer and stable arc can be obtained.(2) In case peak time t_p is equal to base time t_b, when I_b>125A and I_b/I_p>0.5,stable arc and sound weld can be obtained.(3) In case t_p/t_<ps><0.5,an extremely stable arc can be obtained, because base current I_b can be selected to a proper current in steady welding current and besides one pulse-one droplet transfer is sustained.(4) Even if the average current I_<αυ> is kept constant, depth of penetration and fused area increase with an increasing I_p and with an decreasing t_<ps>.(5) Mechanical properties of butt welded joints obtained by pulsed current are equal to those by steady current.
社団法人溶接学会の論文
1987-11-05