Steel Tips from the Structural Steel Educational Council

Steel TIPS

03.1998 > Compatibility of Mixed Weld Material

By Alvaro L. Collin and James P. Putkey

Compatibility of Mixed Weld Material

For many years fabricators and erectors have used, as common practice, electrodes with different specifications and classifications in the same weld (mixed weld metals). Mixed weld metal results from: Different root pass and fill-in pass electrodes. Weld repair work to both shop and field welds. The more recent practice of making field welds over shop welds. Compatibility is a basic requirement of mixed weld metals. The different electrodes and the mixed weld metal must have, as a minimum, matching yield strength, tensile strength, and impact properties--if impact properties are specified. In this SteelTIPS, the authors will limit their discussion to two welding processes: Shielded Metal Arc Welding (SMAW). Flux Cored Arc Welding (FCAW).

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