Submerged-arc welding method for K-shaped groove of low-temperature high-manganese austenite steel

A K-shaped groove, austenitic steel technology, used in welding equipment, arc welding equipment, manufacturing tools, etc., to ensure stable use and good shape control.

Pending Publication Date: 2021-03-19
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the weldability and welding process of these m

Method used

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Effect test

Embodiment 1

[0026] A submerged arc welding process for high manganese austenitic steel K-groove for low-temperature use. The high-manganese austenitic steel for low-temperature use is processed into a K-shaped groove with a unilateral angle of 45°. The groove has no blunt edges and gaps The test plate to be welded and the remaining gap are fixed by spot welding, and the groove is polished with a grinder to remove scale and oil. The test board to be welded does not need to be preheated.

[0027] The welded test plate is 30mm thick high manganese austenitic steel for low temperature.

[0028] The chemical composition of the high manganese austenitic steel for low temperature is: C is 0.3-0.4wt%, Si is 0.18wt%, Mn is 24wt%, and Ni is 0.6wt%. The mechanical properties of the steel are: the tensile strength is 690MPa, and the impact energy Akv=100J at -196°C.

[0029] Submerged arc welding process parameters: the bottom welding current is 340A, the welding voltage is 29V, and the welding spe...

Embodiment 2

[0032] A submerged arc welding process for high manganese austenitic steel K-groove for low-temperature use. The high-manganese austenitic steel for low-temperature use is processed into a K-shaped groove with a unilateral angle of 45°. The groove has no blunt edges and gaps The test plate to be welded and the remaining gap are fixed by spot welding, and the groove is polished with a grinder to remove scale and oil. The test board to be welded does not need to be preheated.

[0033] The welded test plate is 30mm thick high manganese austenitic steel for low temperature.

[0034] The chemical composition of the high manganese austenitic steel for low temperature is: C is 0.3-0.4wt%, Si is 0.18wt%, Mn is 24wt%, and Ni is 0.6wt%. The mechanical properties of the steel are: the tensile strength is 690MPa, and the impact energy Akv=100J at -196°C.

[0035] Submerged arc welding process parameters: the bottom welding current is 360A, the welding voltage is 30V, and the welding spe...

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Abstract

The invention discloses a submerged-arc welding method for a K-shaped groove of low-temperature high-manganese austenite steel. The method comprises the following steps: forming the K-shaped groove ina steel plate to be welded at a unilateral angle of 45 degrees, flatly placing the steel plate on a welding platform, and not preheating before welding; adopting a forced forming welding process forbacking welding, and after backing welding is completed, adopting the same welding process for filling cover faces of the front face and the back face of the K-shaped groove; adopting a front-surfaceand back-surface alternate welding process for the submerged-arc welding , and carrying out back-surface welding after front-surface welding is carried out for two times; carrying out cosmetic weldingon the front surface after carrying out back-surface welding for two times, and finally carrying out cosmetic welding on the back surface; and after welding is completed, controlling the deformationdegree to be below 2 degrees. The method is a matched welding process of a matched welding material of the low-temperature high-manganese austenite steel, stable use of the matched welding material isguaranteed, it is guaranteed that the performance of the matched welding material is not inconsistent due to mismatching of the welding process, and a gap is filled in the welding process of the matched submerged-arc welding material of the low-temperature high-manganese austenite steel.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a K-groove submerged arc welding process of high manganese austenitic steel for low temperature. Background technique [0002] Liquefied natural gas (LNG) is a clean and efficient energy source, and its industrial development has been valued by various countries. However, its storage and transportation conditions are very harsh, and the working temperature is -163°C. Low-temperature high-manganese austenitic steel, as an important material that can replace 9Ni steel to make LNG storage and transportation equipment, has become a key product developed by major domestic steel companies. In order to ensure that the domestic LNG market is not seized by South Korea and other countries, the development of supporting welding materials for low-temperature high-manganese austenitic steel is also being carried out simultaneously. At present, welding wires for submerged arc welding, flux-co...

Claims

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Application Information

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IPC IPC(8): B23K9/18B23K9/235
CPCB23K9/186B23K9/235
Inventor 吴君明王红鸿施小凡彭思远田浩李松汪晶洁孙超尹雨群
Owner NANJING IRON & STEEL CO LTD
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