Welding of high-alloy Cr-Ni steels with a magnetically impelled arc and auxiliary electrode

Gerlach, M; Wolf, D.

doi:10.1080/09507118709449374

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“…The pipe ends to be welded are separated by a small gap, and a welding arc is established in the gap. A static radial magnetic field is then superimposed upon the gap and this causes the arc to rotate in accordance with the principle of Fleming's left hand rule [1][2][3]. The magnetically impelled arc butt (MIAB) welding process uses a rotating arc as its heat source and is known as an efficient method for pipe butt welding.…”

Section: Introductionmentioning

confidence: 99%

Effect of Upset Current in Magnetically Impelled Arc Butt (MIAB) Welding of Carbon Steel Tubes

Sivasankari

Balusamy

Buvanashekaran

2014

AMM

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Magnetically Impelled Arc Butt (MIAB) welding is an unique forge welding process in which an arc is drawn in the gap between the two tubes to be welded in order to raise them to a high temperature to allow forging to form a solid state weld. This paper presents the investigations carried out on MIAB welding trials of carbon steel tubes with varying upset current. Upset current is the short pulse of high current applied prior to upset. It plays a significant role in expulsion of molten metal and impurity from weld interface. This study aims at studying the effect of upset current on weld properties. Carbon steel tubes of SA-210 Grade A have been chosen with outside diameter of 44 mm and thickness of 4.5 mm. Mechanical and microstructural characterization of MIAB weldments was carried out. Good correlation exists between the mechanical properties/microstructure and upset current. Lower upset current has detrimental effect on weld tensile strength due to incomplete expulsion of decarburized zone.

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Section: Introductionmentioning

confidence: 99%