MMA process use drooping characteristic power source and consumable electrodes which produces arc by scratching the electrode with the job forming a short circuit. It is only when the short circuit is broken, arc is formed and the main welding current starts flowing. Welding takes place as the electrode gets fused with the job under the cover of the slag. In case of TIG, arc starts between tungsten electrode (non-consumable) and the job under the cover of inert gas. Arc is started by scratching the tungsten electrode with the job or using a high frequency unit which initiates the arc between the tungsten electrode and the job.

MMA process use drooping characteristic power source and consumable electrodes which produces arc by scratching the electrode with the job forming a short circuit. It is only when the short circuit is broken, arc is formed and the main welding current starts flowing. Welding takes place as the electrode gets fused with the job under the cover of the slag. In case of TIG, arc starts between tungsten electrode (non-consumable) and the job under the cover of inert gas. Arc is started by scratching the tungsten electrode with the job or using a high frequency unit which initiates the arc between the tungsten electrode and the job.