Pulsed Arc Duty Cycle
The ratio of pulse duration to the total period of a pulse cycle in arc welding. It determines heat input and thermal stress on the material.
Physical-Chemical Mechanism of Action
The pulse duty cycle indicates how long the arc is active during a pulse cycle. A higher duty cycle means a longer activation time and thus greater heat input into the material.
Metallurgical Relevance & Welding Risks
A too high duty cycle leads to excessive thermal stress, causing distortion and potential cracks in the material. A too low duty cycle prevents adequate heat transfer, resulting in poor weld formation and lack of fusion.
Workshop Practice & Operating Instructions
To achieve an optimal duty cycle, set the process parameter so that the thermal stress on the material is in the critical temperature range. This can be done by adjusting pulse duration and the total period of the pulse cycle. A typical duty cycle is between 20% and 50%, depending on specific material properties and desired weld result.