The term weldability has often been limited to manufacturing aspects of girth welds in tubular steel products. Hot cracking in the root pass, as wail as the hydrogen-induced cracking have typically been addressed in tubular steel weldability predictions. Most alloy development has therefore been limited to lowering the heat affected zone hardenability. The present work addressed instead weldability in terms of the service performance of girth welds. Physical simulations in a Gleeble 1500 system were performed to produce homogenous microstructures and subject them to well determined applied stresses. A modified ASTM A 710-type steel was examined and the effects of systematic variations in composition were studied with consideration of alloying costs and optimum seamless-pipe manufacturing characteristics. Alloy screening was performed by testing the fracture toughness and stress relief cracking susceptibility in simulated heat affected zones. It was shown that weldability can be optimized during the alloy development stage without performing a single weld. Subsequent melting of commercial heats, manufacture of seamless pipe and successful girth welding confirmed the validity of the predictions.
Weldability of steels and physical simulations
1999
Seiten
Conference paper
Storage medium
English
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