Welding method for low-temperature steel casting and marine plate

Abstract

The invention discloses a welding method for a low-temperature steel casting and a marine plate. The welding method comprises the steps that S10, materials are prepared, namely the low-temperature steel casting and the marine plate are provided; the low-temperature steel casting is firstly chamfered and then is subjected to thermal treatment; the marine plate is not chamfered; S20, preheating is performed before welding, and the welded plates are preheated to 100 DEG C; S30, welding is performed; and multi-layer weld beads are arranged; each layer starts from the marine plate and ends at the low-temperature steel casting until the whole weld beads are finished. The low-temperature steel casting is chamfered before thermal treatment, and through thermal treatment, stress at chamfers is eradicated, so that welding quality is improved; the low-temperature steel casting and the marine plate are preheated before welding, and thermal preservation is performed during welding, so that welding joint defects are decreased after welding through the special arrangement of the weld beads; low-temperature impact performance of the welding joints and heat-affected areas is effectively improved; welding quality is ensured; and the welding joints can withstand low-temperature impact test at 60 DEG C after welding.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a welding method for a low-temperature steel casting and a ship plate. Background technique [0002] The existing welding process of low-temperature steel castings and marine plates can only meet the low-temperature impact test at -40°C, so that the low-temperature steel castings and marine plates welded by the existing welding process cannot be used in an environment lower than -40°C On ships, it has added insurmountable difficulties to the manufacture of polar ships. Contents of the invention [0003] The purpose of the present invention is to provide a welding method for low-temperature steel castings and marine plates. The welded plates can withstand the low-temperature impact test at -60°C, which increases the low-temperature impact performance of the weld and can meet the requirements of lower temperature environments. Polar shipbuilding. [0004] For reaching above-me...

AI Technical Summary

Problems solved by technology

[0002] The existing welding process of low-temperature steel castings and marine plates can only meet the low-temperature impact test at -40°C, so that the low-temperature steel castings and marine plates welded by the existing welding process cannot be used in an environment lower than -40°C Ships add insurmountable difficulties to the manufacture of polar ships

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