Study on high quaity welding process by magnetic stirring.

Ohmae, Takashi; Wakamoto, Ikuo; Nagareda, Masazumi

doi:10.2207/qjjws.3.117

Cited by 7 publications

(3 citation statements)

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“…The researches concerning the usage of electromagnetic force have been carried out to improve a behaviour of molten pool 1. They include an arc control method (such as a magnetically impelled arc) and a magnetic stirring method generating electromagnetism torque 2. Since the direction of the electromagnetic force is not in the antigravity direction in these methods, it is difficult to control the bead shape.…”

Section: Introductionmentioning

confidence: 99%

Study on the application for electromagnetic controlled molten pool welding process in overhead and flat position welding

Shoichi

Yukio

Koki

et al. 2013

Science and Technology of Welding and Joining

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In fusion welding, gravity makes a molten metal flow downward and it sometimes causes an irregular shaped weld bead and weld defects such as an undercut. To solve this problem, the authors propose a new electromagnetic controlled molten pool welding process method which controls the molten metal flow by using upward electromagnetic forces, and the applicability of this method to industry is examined. In flat position welding with excessive heat input, the molten metal tends to sag down and an undercut defect is likely to occur. It is found that the upward electromagnetic force given by adjusting the conditions of magnetic field can lift the molten metal up, resulting in the remarkably improved shape of a penetration bead. It is further found that, even in overhead position welding, a well shaped penetration bead without undercuts is obtained by adjusting the welding touch angle as well as magnetic field conditions.

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Section: Introductionmentioning

confidence: 99%

Study on the application for electromagnetic controlled molten pool welding process in overhead and flat position welding

Shoichi

Yukio

Koki

et al. 2013

Science and Technology of Welding and Joining

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show abstract

“…It has been reported that this process induced the refinement of the solidification grains of the weld metal of Al alloys, stainless steels and so on. 93 " 95 Also, Kou and Le 96 conducted the magnetic rocking of the arc with the electromagnet placed at 4 positions around the TIG torch to show that, by snaking the bead, columnar grains are segmented and effectively refined and also the growth direction of the crystals become non-straight lined, hence inducing the cracking resistance to improve. 30 Example of solidification grains when the arc is stirred magnetically (AI2014 alloy, 1 Hz, 15 mm stirring).…”

Section: Formation Of Solidification Macrostructurementioning

confidence: 99%

Solidification and solidification structure control of weld metals

Koseki

2002

Welding International

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“…Similarly, researchers have also used an external magnetic field in the vertical direction. Ohmae et al concluded that metallurgical improvements such as grain refinement were possible by generating a rotation action using the electromagnetic force in the molten pool, for TIG welding 6) . In addition, we suppressed the irregular beads in high speed welding employing pure argon as a shielding gas, by generating a rotation action using the electromagnetic force in the molten pool 7) .…”

Section: Introductionmentioning

confidence: 99%