Underwater welding

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When using special underwater welding electrode and welding pieces come into contact, the resistance heating will make contact points' water evaporate, forming a gas phase zone. When  the welding electrode left slightly , the arc ignites the gas phase zone, which in turn by the arc heat will evaporate a large amount of  water and covering of gases, forming the arc cavity, through underwater welding operation, arc cavity grow continually , and then burst, part of the gas escape in the form of bubbles , arc  cavity become smaller. Then the gas of arc heating make the arc cavity big again, and so the cycle, arc cavity in metastable state, the arc in the metastable state will burn in the cavity, the welding process.