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304L austenitic stainless steel MIG welding method

A technology of austenitic stainless steel and welding method, applied in the direction of welding medium, welding equipment, welding equipment, etc., can solve problems such as not meeting the requirements of use, achieve the effect of eliminating small unfused, improving low temperature toughness, and realizing engineering application

Pending Publication Date: 2020-06-05
WUHAN YIYE STEEL STRUCTURE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for some military products, such as large-scale low-temperature wind tunnels, it is required that the impact energy of welded joints should reach 50J or higher after heat treatment at -196°C, and the traditional MIG welding process is far from meeting the requirements.
However, there are almost no domestic research results in this area.

Method used

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  • 304L austenitic stainless steel MIG welding method
  • 304L austenitic stainless steel MIG welding method
  • 304L austenitic stainless steel MIG welding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] The specific steps of this welding method are as follows:

[0071] (1) Preparation before welding

[0072] A 500×150×40mm (2 pieces) 304L austenitic stainless steel test plate was prepared with a beveling machine for a symmetrical X-shaped bevel, with a single-side bevel angle of 35°, and a grinder (stainless steel grinding wheel) was used to align the bevel Grind and clean the 20mm range on both sides to remove oil and impurities; use oxyacetylene neutral flame to quickly heat the 20mm range on both sides of the 304L base metal groove to remove moisture; combine the two test plates to be welded Assembling, the blunt edge is 0mm, the gap is 3mm, and the spot welding is carried out by argon tungsten arc welding. The welding material and welding process of the spot welding are the same as that of argon tungsten arc welding bottom welding (front groove). After the spot welding is finished, use a grinder to grind the weld seam on the back of the spot welding until the silv...

Embodiment 2

[0082] The shielding gas in this welding method is 98%Ar+2%CO 2 , the unilateral bevel angle is 30°, and the rest of the welding process is consistent with Example 1.

[0083] After testing, the tensile strength of the welded joint is 581MPa, the two side bending samples have no cracks, and the two side bending samples have some cracks of 0.6~2.1mm. The impact energy of welded joints at -196°C is: argon arc welding seam 73J, argon arc welding heat affected zone 128J, MIG welding seam 52J, MIG welding heat affected zone 103J, greater than 50J, in line with military products such as large low temperature wind tunnel for Welded joints -196 ℃ impact energy requirements, but there is no allowance. Compared with the -196°C impact energy of the MIG welded joint in Example 1, both the weld seam and the heat-affected zone have decreased in value, indicating that there are subtle The lack of fusion reduces the low temperature toughness at -196°C.

Embodiment 3

[0085] In this welding method, the groove form is a symmetrical K-shaped groove, the single-side groove angle is 45°, and the shielding gas is 98%Ar+2%O 2 , the rest of the welding process is consistent with embodiment 2.

[0086] After testing, the tensile strength of the welded joint was 559MPa, and several cracks of 0.4~2.6mm appeared in three side bending samples, and one side bending sample was intact. The impact energy of welded joints at -196°C is: argon arc welding seam 68J, argon arc welding heat affected zone 133J, MIG welding seam 48J, MIG welding heat affected zone 94J, among which the impact energy of MIG welding seam <50J, does not meet the requirements Military products such as large-scale low-temperature wind tunnels require -196°C impact energy for welded joints. It shows that in the welded joints using the above-mentioned shielding gas and groove angle, there is a slight lack of fusion, which reduces the low-temperature toughness at -196°C.

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Abstract

The invention discloses a 304L austenitic stainless steel MIG welding method. The welding method comprises the following steps of preparing grooves in 304L base materials, removing moisture on the twosides of the grooves, conducting assembly on the 304L base materials to be welded, and conducting tack-welding through tungsten electrode argon arc welding; conducting bottoming welding through double-sided tungsten electrode argon arc welding, wherein welding wires adopt ER316L; conducting welding on a filling layer and a surfacing layer through MIG welding; and conducting heat treatment on welded 304L austenitic stainless steel welded joints at the heat treatment temperature of 550-590 DEG C for 1-2 h of temperature holding. Through the 304L austenitic stainless steel MIG welding method provided by the invention, the low-temperature toughness of the 304L austenitic stainless steel MIG welded joints can be improved.

Description

technical field [0001] The invention relates to the technical field of welding technology, in particular to a welding method for MIG welding of 304L austenitic stainless steel. Background technique [0002] 304L austenitic stainless steel has high strength and excellent low-temperature toughness and shaping. At the same time, due to its low carbon content, it has excellent corrosion resistance. It is often used as low-temperature steel, such as domestically produced cryogenic liquid storage and transportation For containers, the operating temperature is usually -196~-183°C, and the main base material is usually 18-8 austenitic stainless steel. [0003] At present, 304L austenitic stainless steel pressure vessel products are mainly welded by electrode arc welding, and MIG welding is relatively less used. Carbon steel is around 200 °C, and it is easy to produce subtle unfused defects during the welding process, thereby reducing the low temperature toughness of the welded join...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/173B23K9/167B23K9/235B23K33/00B23K35/30B23K35/38B23K9/02C21D6/00C21D9/50C22C38/02C22C38/04C22C38/42C22C38/44C22C38/58B23K103/04
CPCB23K9/173B23K9/167B23K9/235B23K33/004B23K35/3086B23K35/383B23K9/02C21D9/50C21D6/004C21D6/005C21D6/008C22C38/02C22C38/04C22C38/002C22C38/58C22C38/44C22C38/42C22C38/001B23K2103/05Y02E30/30
Inventor 闵晓峰潘伍覃邹大军王葳吴梦先林德钰候华东郭则明方亮汪伏波
Owner WUHAN YIYE STEEL STRUCTURE
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