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Nickel base alloys are frequently applied in safety-relevant fields such as chemical plant construction or power plant engineering. Particularly on account of their cubic face-centered solidification characteristic, these materials are frequently susceptible to metallurgy-specific hot cracking during fusion welding. A classification of these materials according to their hot cracking resistance in the MVT-Test (Modified Varestraint Transvarestraint Test) is carried out by the example of a series of base and welding filler materials. Moreover, it has been proven by the MVT Test that the hot cracking resistance of nickel base alloy (Alloy 602 CA) can be improved by selecting appropriate shielding gases.