engleski

Effect of nonmetallic inclusions on steel welds metal hot cracking

Intercrystally distributed nonmetallic inclusions g reatly increase weld susceptibility to hot crack ing. Oxide and sulphide inclusions are the result of contaminated base material or its highly oxidised surfaces and they can be a consequence of metallurgical reactions between welding slag and remelted base material, while carbide inclusions can occur due to the mixing of high- carbon base and low- carbon Ā ller material. All welding surfaces must thus be cleaned before welding and the least possible mixture of base with Ā ller material must be enusured during welding.

nonmetal inclusions ; dissolution of base metal ; oxidized surface ; hot cracking

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