Welding Cracking Analysis and Cracking Mechanism of 347 Stainless Steel Catalyst Beam

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Cracks were predominantly found in the coarse-grained heat-affected zone near the fusion line, indicating a critical failure area.
Experiment results highlighted intergranular cracking with significant oxidation but absence of dimple or cleavage microstructures.
The presence of low-melting-point eutectic phases near the crack tip induced grain boundary liquefaction, promoting further cracking.
Thermal stress and expansion of liquefied zones rapidly propagate microcracks, leading to larger fractures.

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This analysis identifies cracking in the heat-affected zone of 347 stainless steel welds, suggesting thermal effects play a significant role.

Zheng et al. (2025) studied this question.

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This analysis identifies cracking in the heat-affected zone of 347 stainless steel welds, suggesting thermal effects play a significant role.