Excessive weld reinforcement
Excessive weld reinforcement is an excessive build-up of weld metal on the surface, leading to uneven notches and affecting the microstructure.
Physical-chemical mechanism of action
Excessive weld reinforcement is caused by too much weld metal being deposited on the surface during the welding process. This leads to the metal in that zone being overly compressed and not behaving uniformly during expansion.
Metallurgical relevance & risks during welding
Excessive weld reinforcement can lead to uneven notch effects at the transition between weld metal and base material. This impairs the microstructure, increases stresses, and raises susceptibility to cracking and fracture. Additionally, it can cause uneven strain states and poor weld strength.
Workshop practice & instructions
To avoid excessive weld reinforcement, the deposition of weld metal should be precisely controlled. This can be achieved by optimizing welding parameters such as voltage and wire feed speed. Too high voltage or wire feed speed leads to excessive reinforcement. It is also important to perform welding in a controlled manner to ensure uniform deposition.