| 摘要 |
FIELD: machine building. ^ SUBSTANCE: invention can be used for underwater manual welding of higher strength low-carbon and low-alloyed steels, in particular, in repair of vital metal structures, for example, pipelines operated underwater. The electrode steel core is alloyed, mainly, with nickel and chromium. The content of the said metals is limited by 19...32% and 21...33%, respectively. The coating components content is as follows, percent by weight i.e. fluorite 22.0-31.0, rutile concentrate 22.0-37.0, iron oxide 15.0-31.0, feldspar 8.0-13.0, metallurgical magnesite 4.0-9.0, ferrosilicon 0.5-2.0, carboxymethyl cellulose 1.5-2.0. the coating weight factor makes 22-25%. The electrode allows in welding in any spatial position a high-quality weld formation, resistance of welded joints to the cold fracture formation in the low-alloyed steel thermal effects zone, higher strength and weld metal properties not worse than those of the base metal. ^ EFFECT: increased strength and improved weld metal mechanical properties not worse than those of the base metal. ^ 1 dwg, 5 tbl |
