Excess Weld Metal
Weld reinforcement is the weld metal that extends beyond the required weld thickness on the cap. Excessive reinforcement leads to sharp transitions and stress concentrations, impairing mechanical properties and increasing hot cracking.
Physicochemical Mechanism of Action
Excess weld metal results from excessive fusion of the material or inaccurate welding parameters. This leads to a weld that is too thick and extends beyond the desired thickness.
Metallurgical Relevance & Risks in Welding
Excessive weld reinforcement can cause sharp transitions and stress concentrations. These can impair mechanical properties like strength and toughness, and increase the risk of hot cracking and other hardness issues in the weld.
Workshop Practice & Action Guidelines
To ensure optimal weld thickness, pay attention to proper fusion time and temperature. Use a carefully calibrated ultrasonic tester or a microscope to check weld thickness. Reinforcement exceeding 0.5 mm is generally excessive and should be avoided.