A Study on the Welding Current in Butt Joint P-GMA Welding with Acute Groove Angles

Kim, Ryoon-Han; Na, Suck-Joo; Kim, Cheol-Hee

Journal of KWJS 2010;28(4):55-60.
Published online September 8, 2010.

작은 그루브 각을 가지는 맞대기 P-GMA 용접에서의 용접전류에 관한 연구

, ,

A Study on the Welding Current in Butt Joint P-GMA Welding with Acute Groove Angles

Ryoon-Han Kim, Suck-Joo Na, Cheol-Hee Kim

Abstract

The purpose of this paper is to propose a mathematical model of welding current for the P-GMAW by modifying the well known GMAW model. Welding power circuit is simply modeled as a RL electric circuit and solved as an ODE equation. The welding current depends on the joint shape, molten pool and welding parameters. To compare the molten pool effect to the welding current, CFD numerical simulation technique was adopted. Welding experiment is also conducted with the same welding parameters as used in numerical simulations to verify the proposed welding current model. The current model which is considered molten pool shape, is more fit to experiment result.

Key Words: P-GMAW, Groove angle, Dynamic arc behavior, Welding current modeling, Molten pool analysis