Kobe Steel, Ltd.

Yimin Yuan

Reiichi Suzuki

Kei Yamazaki

Tomoko Sugimura

Hidenori Nako

Yoshitomi Okazaki

Keito Ishizaki

Disclosed herein is an electroslag welding wire containing, by mass % based on total mass of the wire: C: more than 0% and 0.07% or less; Si: more than 0% and 0.50% or less; Mn: more than 0% and 1.0% or less; Ni: 6.0 to 15.0%; and Fe: 79% or more. The electroslag welding wire satisfies the following relationship (1): 0.150&#x2264;C+Si/30+Mn/20+Ni/60&#x2264;0.300 (1).

Wire for electroslag welding, flux for electroslag welding and welded joint

Disclosed is a method for performing gas-shielded pulsed arc welding at high current densities with a flux-cored wire as an electrode wire. The pulsed arc welding is carried out by passing a pulsed current so that a pulse peak current density during a pulse peak time Tp is 400 to 950 A/mm, a pulse base current density during a pulse base time Tb is 200 A/mmor more and differs from the pulse peak current density by 200 to 400 A/mm, and an average current density is 350 to 750 A/mm. The method allows significant spatter reduction while attaining a high deposition rate.

High-current-density gas-shielded arc welding

In a tandem gas-shielded arc welding method, carbon dioxide is used as a shielding gas for a leading electrode formed by a solid wire, an argon-carbon dioxide gas mixture containing at least 60% by volume of argon gas is used as a shielding gas for a trailing electrode formed by a solid wire or a flux-cored wire, both the leading electrode and the trailing electrode have a reverse polarity, the leading electrode satisfies the relationships '5.00&#x2266;(I&#xb7;V&#xb7;10)/(W&#xb7;&#x3c0;r)&#x2266;10.00' and '(I&#xb7;10)/V&#x2267;4.50', and the trailing electrode satisfies the relationships &#x201c;4.00&#x2266;(I&#xb7;V&#xb7;10)/(W&#xb7;&#x3c0;r)&#x2266;7.00&#x201d; and &#x201c;(I&#x2003;10)/V&#x2267;8.00&#x201d;.

Growing community of inventors

Fujisawa, Japan

Yimin Yuan