Cold Metal Transfer Welding Process Kinematics
The CMT process (Cold Metal Transfer Welding) uses mechanical energy to separate the welding wire and form a droplet. This minimizes heat input and enables joining of different materials.
Physical-Chemical Working Mechanism
The CMT process uses a mechanical backward movement of the welding wire to separate and form a droplet. This is done by coupling a thermal energy source with a highly dynamic movement at the start of the short circuit.
Metallurgical Relevance & Welding Risks
The CMT process minimizes heat input and prevents the wire from melting. This is particularly advantageous for joining a wide variety of material combinations, such as steel with aluminum. An incorrectly adjusted process can lead to uneven weld spacing or missing droplets.
Workshop Practice & Action Guidelines
To successfully set up the CMT process, the following parameters must be observed:
• Mechanical movement speed: 10-20 m/s
• Thermal energy source: 300-500 W
• Short circuit time: 0.5-1 ms
These settings ensure precise droplet separation and a homogeneous weld structure.