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TECHNICAL PAPERS

Weld Distortion Control During Welding Process With Reverse-Side Heating

[+] Author and Article Information
Masahito Mochizuki1

Department of Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1, Yamada-oka, Suita, Osaka 565-0871, Japanmmochi@mapse.eng.osaka-u.ac.jp

Masao Toyoda

Department of Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1, Yamada-oka, Suita, Osaka 565-0871, Japantoyoda@mapse.eng.osaka-u.ac.jp

1

Corresponding author.

J. Eng. Mater. Technol 129(2), 265-270 (Jun 05, 2006) (6 pages) doi:10.1115/1.2400275 History: Received December 11, 2005; Revised June 05, 2006

An in-process method for controlling welding distortion in fillet welds is developed. It particularly reduces angular distortion by performing reverse-side Tungsten inert gas (TIG) heating of the weld line at a fixed distance ahead of metal inert gas (MIG) welding during the weld process. Various heating conditions are examined by experiment and by the finite-element analysis in order to determine appropriate conditions and to study the mechanism by which welding distortion is reduced. It is consequently found that this mechanism is a result of two main effects: TIG heating effect on the reverse side, which produces the opposite angular distortion, and preheating effect.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Configuration of a fillet-welded joint

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Figure 2

Schematic illustration of welding distortion control by reverse-side heating

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Figure 3

Effects of distance from MIG torch to TIG torch on angular distortion obtained by experiment

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Figure 4

Experimental effects of TIG heat input on angular distortion

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Figure 5

Three-dimensional finite-element analytical model for studying production mechanism of welding distortion by reverse-side heating method

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Figure 6

Physical and mechanical properties for finite-element analysis: (a) physical properties used in heat-conduction analysis; and (b) mechanical properties used in thermal elastic–plastic stress analysis

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Figure 7

Comparison of temperature history for determining heat efficiency in heat-conduction analysis: (a) MIG welding; and (b) TIG heating

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Figure 8

History of longitudinal distribution of angular distortion by MIG welding only obtained by thermal elastic–plastic analysis

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Figure 9

History and production mechanism of angular distortion obtained by thermal elastic–plastic analysis

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Figure 10

Two reduction mechanism from results of angular distortion obtained by thermal elastic–plastic analysis: (a) effect of preheating on angular distortion; and (b) history of angular distortion by only TIG heating

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Figure 11

Comparison of longitudinal residual stress at the center of weld line on front surface obtained by thermal elastic–plastic analysis

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Figure 12

Effects of distance between TIG and MIG torches on angular distortion obtained by thermal elastic–plastic analysis

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Figure 13

Effects of TIG heat input on angular distortion and longitudinal shrinkage obtained by thermal elastic–plastic analysis

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Figure 14

Effects of preheating area on angular distortion and longitudinal shrinkage obtained by thermal elastic–plastic analysis

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