An Efficient Welding Method to Control the HAZ Softening of Ultra Fine Grained Steel Weldment

Joong Geun Youn; Tae Dong Park

doi:10.4028/www.scientific.net/MSF.580-582.343

Paper Titles

Numerical Studies of Explosive Welding of Three-Layer Cylinder Composites-Part 2
p.327

Experimental and Numerical Investigations of Residual Stress Distributions in the TIG Welding Process
p.331

Experimental and Numerical Studies of the Effects of Process Parameters in the Continuous Friction Welding Process
p.335

Cooperative Control of Robotic Welding System in One Side Backingless V Groove Welding
p.339

An Efficient Welding Method to Control the HAZ Softening of Ultra Fine Grained Steel Weldment
p.343

Selection of the GTAW-Flux Process Parameters on Type 310 Stainless Steel via a Taguchi-Neural Approach
p.347

Effect of Probe Thread on Friction Spot Joint Strength of AZ31 Mg Alloy
p.351

Laser-Arc Hybrid Welding Process of Galvanized Steel Sheets
p.355

Numerical Analysis of Arc Plasma with Metal Transfer in GMAW
p.359

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An Efficient Welding Method to Control the HAZ Softening of Ultra Fine Grained Steel Weldment

Abstract:

The HAZ softening of the ultra fine grained steel weldment occurs when welding heat input is higher than the critical value. The critical welding heat input was found to be about 10kJ/cm for the steel studied. The lowest hardness value and the width of the softened HAZ are dependant on the applied welding heat input. For obtaining high productivity with the low heat input, less than 10kJ/cm, a high speed FCA welding process with 2 electrodes was developed and verified to be an efficient method for the ultra fine grained steel. The weldment made by this process did not have the softened HAZ; and thus, satisfied the tensile strength required.