E309L stainless steel lengthened welding electrode capable of being used for large-current welding

Abstract

Provided is an E309L stainless steel lengthened welding electrode capable of being used for large-current welding. A coating contains marble, fluorite, rutile, dehydrated potassium feldspar, dehydrated mica, bismuth oxide, chrome green, magnetite, sodium carbonate, micro-carbon ferro chrome, electrolytic manganese metal, zircon sand, potassium fluoroaluminate, rare earth fluoride, chromium metal and metallic nickel, blending and even stirring are conducted according to the ratio of the coating, 15-20% of sodapotash water glass is added and evenly stirred according to the total weight of the coating, the coating and an ER308L welding wire are put in an oil pressure type welding electrode extrusion press to produce and prepare the lengthened welding electrode, and no coating cracks or flushing can happen when the large current is 170-180 A and the welding core length is 450 mm; though an ER308L welding core is adopted, the cladding metal chemical components meet the requirement of E309L chemical components through the coating transition alloy method, and therefore the welding electrode has good welding process performance and is stable in electric arc, convenient to operate, good in weld appearance during welding, and sediments are easily separated.

Description

technical field [0001] The invention belongs to the technical field of welding materials, in particular to an E309L stainless steel elongated welding rod which can be used for high-current welding. Background technique [0002] Pressure vessels are widely used in petrochemical, nuclear power, thermal power, chemical and other fields, and generally need to withstand high temperature and high pressure. The welding of the inner wall of the pressure vessel generally adopts large-area austenitic stainless steel strip surfacing welding, but common welding rods are used for welding joints, flanges, irregular shapes or defects. [0003] Austenitic stainless steel strip surfacing usually uses 309L, 308L, 316L or 347L stainless steel electrodes, of which 309L is the isolation layer surfacing electrode, and the length of the electrode is generally 350-400mm. However, in actual welding conditions, in order to complete the task as soon as possible, welders often use high-current welding...

AI Technical Summary

Problems solved by technology

However, in actual welding conditions, in order to complete the task as soon as possible, welders often use high-current welding that exceeds the specification requirements, especially when welding to the tail of the electrode, it is prone to problems such as redness of the coating and cracking of the tail of the electrode, which cannot be welded again. And cause welding rod waste

[0004] There is no relevant report on the E309L stainless steel electrode that can perform high-current welding

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