Why is it important to use a gas nozzle of the correct size?

The length of the gas nozzle has an effect on the heat load of the contact tip, the splash protection of the contact tip, and the welding current. When choosing a nozzle size, it is best to use the largest possible hole diameter, as it helps to optimize gas coverage during welding. It also helps reduce the chances of accumulating spatter that can cause porosity.

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