Cold Metal Transfer Welding Heat Input
The Cold Metal Transfer Welding heat input is a method in which the thermal input into the base material is minimized. This leads to a drastic reduction of thermal distortion and upsetting.
Physical-Chemical Working Principle
In Cold Metal Transfer Welding heat input (CMT), the welding process is designed so that the thermal input into the base material is minimized. This is achieved by controlled use of shielding gases and special welding parameters.
Metallurgical Relevance & Risks in Welding
Reducing the thermal input prevents upsetting and thermal distortion, leading to a finer-grained and tougher weld seam. However, too high heat input can lead to hot cracks and a coarsened microstructure.
Workshop Practice & Action Instructions
To successfully use Cold Metal Transfer Welding heat input, the following parameters should be observed:
• Use a high-quality shielding gas mixture (e.g., argon).
• Set the welding voltage to 100 N/mm².
• Keep the heat source as far away from the material as possible to minimize thermal input.
• Cool the weld seam slowly and in a controlled manner.