Production process of automatic welding wire for low-alloy high-strength and high-toughness steel for ships without preheating and copper plating

Abstract

The invention relates to a preheating-preventing copper-plating-preventing marine low-alloy high-strength and high-fracture-toughness-steel automatic welding stick production process. The production process is characterized in that a welding stick comprises, by weight, 0.02%-0.1% of C, 2%-4% of Mn, 2%-4% of Ni, 0.5%-1% of Mo, 0.5%-0.8% of Si, 0-0.5% of Cu, 0-1.2% of Cr, 0-0.12% of V and 0-0.05% of Ti. The production process includes the steps of vacuum melting, forging, steel rolling, wire rod hot rolling, mechanical rust removing, chlorohydric acid pickling, neutral washing, high pressure water cleaning, alkali neutralization, boronizing, soap lye saponification, drying, cold drawing for the first time, recrystallization annealing, chlorohydric acid pickling, neutral washing, high pressure water cleaning, alkali neutralization, boronizing, soap lye saponification, drying, cold drawing for the second time, chlorohydric acid pickling, neutral washing, high pressure water cleaning, alkali neutralization, soap lye saponification, brilliant polishing drawing and aqueous rust preventive coating.

Description

[0001] This application is a divisional application. The application number of the original application: 2012104987530, the title of the invention: A production process of low-alloy steel automatic welding wire for ships without preheating and copper plating, application date: 2012-11-30. Technical field [0002] The invention relates to the field of preparation of automatic welding wires, in particular to a low-alloy steel automatic welding wire for ships without preheating and copper plating and its production process. Background technique [0003] Low-alloy high-strength steel has good weldability, excellent formability and low manufacturing cost, so it is widely used in pressure vessels, vehicles, bridges, construction, engineering machinery, mining machinery, textile machinery, marine structures, ships, Electricity, petrochemical, military products, aerospace and other fields. With the improvement of steel alloy element content, strength level and welding structure restraint,...

AI Technical Summary

Problems solved by technology

[0004] In production, preheating before welding and heat treatment after welding are usually used to avoid welding cracks, which will bring a series of problems such as complex production process, increased production cost, reduced production efficiency and deteriorated working environment, and will also increase the welding cost. Heat-affected zone softening tendency

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