Failure of a Fusion Welded Ball Joint as a Result of Modification in MnS Direction |
| |
Authors: | Marina Banuta Isabelle Tarquini Benoit Gauvin |
| |
Affiliation: | (1) SGS Canada, Montreal, QC, Canada |
| |
Abstract: | A failure investigation was performed on a ball joint from an ATV front suspension system. The location of the fracture was
the bearing ball/stud interface, which is a fusion-welded joint, and occurred after approximately 20 h of field-testing. The
two parts are made out of carbon steel and were previously heat-treated. Many elongated MnS inclusions were found in the stud
material, and these inclusions were parallel to the symmetry axis. Even though these inclusions were not significantly sized,
their number was important. Macroscopic evidence showed that the joint failed in a ductile mode under centered tensile overload.
Microscopic examination showed that MnS orientation changed in the fusion joint area. The inclusions had been redirected during
the welding process and laid parallel to the fracture surface. This reorientation caused a significant decrease in the effective
cross section of the joint and overload fracture occurred. |
| |
Keywords: | Ball joint Elongated MnS Fusion welding Failure analysis |
本文献已被 SpringerLink 等数据库收录! |