Method of laser-MIG electric arc hybrid welding of low nickel nitrogen-containing austenitic stainless steel

An austenitic stainless steel, composite welding technology, applied in laser welding equipment, welding equipment, welding/welding/cutting objects, etc., can solve the problems of high probability of porosity and poor stability of welded joints, and achieve a flat hardness distribution trend and thermal stability. The effect of a small area of ​​influence and no tendency to harden

Pending Publication Date: 2020-06-12
HARBIN WELDING INST LTD
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Problems solved by technology

[0005] The present invention provides a laser-MIG arc hybrid welding method for low-nickel nitrogen-containing austenitic stainless ste

Method used

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  • Method of laser-MIG electric arc hybrid welding of low nickel nitrogen-containing austenitic stainless steel
  • Method of laser-MIG electric arc hybrid welding of low nickel nitrogen-containing austenitic stainless steel
  • Method of laser-MIG electric arc hybrid welding of low nickel nitrogen-containing austenitic stainless steel

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specific Embodiment approach 1

[0034] Embodiment 1: A method of laser-MIG arc hybrid welding of low-nickel nitrogen-containing austenitic stainless steel in this embodiment is carried out according to the following steps:

[0035] 1. Set the steel plate to be welded (300mm×150mm×12mm) into a butt joint with a joint gap of 1.5mm, and process a V-shaped groove with a groove angle of 60° and a blunt edge thickness of 2mm;

[0036] 2. Set the composite welding shielding gas as a mixed gas of nitrogen and argon, and the volume fraction of nitrogen in the mixed gas is 2%;

[0037] 3. Simultaneously carry out the composite welding of laser and MIG arc, the process parameters of the laser welding: the laser power is 2500W, the welding speed is 6.7mm / s, the defocus is +20mm, and the laser incident angle is 6°; the MIG The process parameters of arc welding: the gas flow rate is 20L / min, the welding current is 180A, the welding voltage is 28V, the dry elongation of the welding wire is 18mm, and the angle of the weldin...

specific Embodiment approach 2

[0043] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the process parameters of the laser welding: the laser power is 3000W, and the welding speed is 8.2mm / s; the process parameters of the MIG arc welding: the welding current is 200A, welding voltage is 28.5V. Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0044] Specific embodiment three: the difference between this embodiment and specific embodiment one is: the process parameters of the laser welding: the laser power is 3500W, and the welding speed is 8.7mm / s; the process parameters of the MIG arc welding: the welding current is 240A, welding voltage is 29.3V. Other steps and parameters are the same as those in the first embodiment.

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Abstract

The invention relates to a method of laser-MIG electric arc hybrid welding of low nickel nitrogen-containing austenitic stainless steel and belongs to the field of welding. The invention aims to solvethe technical problem that by adopting a welding method for low nickel nitrogen-containing austenitic stainless steel at present, the pore probability in a welded joint is relatively high and the stability is relatively poor. The method comprises the following steps of I, arranging a to-be-welded steel plate as a welded joint and processing a V-shaped groove; II, arranging hybrid welding protective gas as mixed gas of nitrogen and argon; and III, performing laser and MIG electric arc hybrid welding synchronously. By welding the low nickel nitrogen-containing austenitic stainless steel by adopting a laser-MIG electric arc hybrid welding process, the welding efficiency is high, the low nickel nitrogen-containing austenitic stainless steel is formed well, and the heat affected zone is small.In addition, compared with other protective gas mixing forms, laser-MIG electric arc hybrid welding of low nickel nitrogen-containing austenitic stainless steel adopting the protective gas of 98% Ar+2%N2is obvious in advantage: the pore probability in the welded joint is small, the welding penetration is large, the electric arc stability is good, the hardness distribution trend is gentle and a quench hardening tendency is avoided.

Description

technical field [0001] The invention belongs to the field of welding, and in particular relates to a laser-MIG arc hybrid welding method for low-nickel nitrogen-containing austenitic stainless steel. Background technique [0002] Relevant scholars have found that in the TIG welding process of 316L stainless steel, adding a certain proportion of nitrogen to the shielding gas argon is helpful to the microstructure and properties of the weld. In the welding process of duplex stainless steel, a certain proportion of nitrogen is usually added to argon to improve the corrosion resistance and dual-phase ratio of the welded joint. In the welding process of austenitic stainless steel, adding 2% nitrogen can increase the proportion of austenite phase, and thus increase the electrochemical stability of welded joints. [0003] Low-nickel nitrogen-containing austenitic stainless steel is a new environment-friendly stainless steel material with excellent performance and high cost perform...

Claims

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Application Information

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IPC IPC(8): B23K26/348B23K26/12B23K26/60B23K26/70B23K103/04
CPCB23K26/125B23K26/348B23K26/60B23K26/702B23K2103/05
Inventor 方乃文李连胜黄瑞生杨义成徐亦楠马一鸣周坤马青军齐万利陈廷玉张宇
Owner HARBIN WELDING INST LTD
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