Weld Cracking of a Stainless Steel Heat Exchanger
A welded ferritic stainless steel heat exchanger cracked prior to service. The welding filler metal was identified as an austenitic stainless steel and the joining method as gas tungsten arc welding. Investigation (visual inspection, SEM images, 5.9x images, and 8.9x/119x images etched with Vilella's reagent followed by electrolytic etching in 10% oxalic acid) supported the conclusion that the heat exchanger cracked due to weld cold cracking or postwelding brittle overload that occurred via flexure during fabrication. The brittle nature of the weld was likely due to a combination of high residual stresses, a mixed microstructure, inclusions, and gross grain...
Weld Cracking of a Stainless Steel Heat Exchanger, ASM Failure Analysis Case Histories: Processing Errors and Defects, ASM International, 2019, https://doi.org/10.31399/asm.fach.process.c0091048
Download citation file:
Join ASM International
Being a member of the world’s largest association of materials professionals provides the benefits and resources you need to accomplish your personal and professional goals.