Technician A says that a tempered frame rail repair that has failed by cracking cleanly through the center of what visually appears to be a good weld could be caused by using the incorrect filler rod.Technician B says that cracks that appear at the sides of what appears to be a good weld on a tempered frame rail can be caused by crystallization.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question

Quizplus · Accepted Answer

Both technicians are correct. Technician A is correct because using the incorrect filler rod can lead to a failure in the weld, especially in materials that require specific properties for welding, such as tempered frame rails. Technician B is correct because crystallization at the sides of a weld can lead to cracks, which is a common issue in welding processes, particularly when the cooling rate and the material properties lead to brittle microstructures.

Technician a Says That a Tempered Frame Rail Repair That