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1. it has been noted that heat transfer in gas-metal arc welding is higher than in shielded-metal arc welding. explain why this would be the case. which process would lead to more heat-affected zone cracking in hardened steels?

Sagot :

The temperatures are lower and the gas-metal arc welding method is simpler to manage than shielded-metal arc welding. Porosity that hinders heat transfer is produced by the higher heat in shielded metal arc welding.

With an externally supplied gaseous shield of inert gas such as argon and/or helium, gas metal arc welding (GMAW) creates an arc between a consumable metal electrode and the work piece as the source of heat. In the shielded metal arc welding (SMAW) process, heat from an electric arc that is maintained between the tip of a consumable electrode and the surface of the base material in the joint being welded results in the coalescence of metals.

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