Welding of steel or cast iron - where weld deposit consists of alternate martensite layers, and layers contg. no martensite, so shrinkage and internal stress are minimised

摘要

The workpieces being joined together are made either of steel, or of cast iron, which can be welded by steel filler materials. The weld deposit consists of at least two layers of different filler material, where after cooling, the filler in one layer forms a structure with a larger vol. than the filler in the other layer. The deposit pref. consists of alternate layers of a steel forming martensite, and a steel forming virtually no martensite. The layers or passes may be made in the usual manner along the seam; or parallel layers of the two different fillers may be deposited simultaneously in one operation using two filler rods located side by side. Avoids the large amt. of internal stress normally present in welds due to the shrinkage of the layers of deposited metal during cooling.