A Plasma Welding Process of Austenitic Stainless Steel 254SMO with Bypass Wire Feeding

A technology of austenitic stainless steel and plasma welding, applied in plasma welding equipment, welding equipment, welding equipment, etc., can solve problems such as difficult quality assurance, increased welding deformation, and large amount of welding materials, so as to improve efficiency and quality , reduce thermal deformation, good weld reinforcement effect

Active Publication Date: 2021-01-26
CHENGXI SHIPYARD XINRONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the welding process for the above-mentioned super austenitic stainless steel 254Smo mainly adopts electrode arc welding (SMAW), submerged arc welding (SAW), and manual argon arc welding (TIG). hot crack defect
Especially for the welding of medium and thick-walled super austenitic stainless steel, the base metal often needs to be beveled on one or both sides for multi-layer multi-layer welding, which will greatly increase the production cost and reduce the production efficiency. And the expansion of the heat-affected zone also leads to the increase of welding deformation
In addition, the traditional welding process requires a lot of pre-weld preparation work, requires opening grooves, requires a large amount of welding consumables, low welding efficiency, large welding deformation, prone to thermal cracks, and difficult to guarantee quality

Method used

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  • A Plasma Welding Process of Austenitic Stainless Steel 254SMO with Bypass Wire Feeding
  • A Plasma Welding Process of Austenitic Stainless Steel 254SMO with Bypass Wire Feeding
  • A Plasma Welding Process of Austenitic Stainless Steel 254SMO with Bypass Wire Feeding

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Effect test

Embodiment 1

[0062] Such as Figures 1 to 5 Shown is the embodiment of the plasma welding process of a kind of austenitic stainless steel 254SMo with bypass wire feeding of the present invention, comprises following processing steps:

[0063] (1) Steel plate cutting: 254SMo stainless steel plate is used to cut and shape according to the design requirements;

[0064] (2) Selection of welding wire: use a welding wire with a diameter of φ1.2mm as the welding wire for bypass wire feeding during plasma arc welding;

[0065] (3) Steel plate pretreatment: perform surface pretreatment on the welding area of ​​the stainless steel plate before welding;

[0066] (4) Steel plate splicing and positioning: the stainless steel plates to be welded are butted, and after the butt joint, the stainless steel plates are spot welded and positioned, and the position of the spot welded positioning is located at the butt seam on the back of the stainless steel plates;

[0067] (5) Install the back protection too...

Embodiment 2

[0101] Adopt the welding process of embodiment 1, carry out the test plate welding of austenitic stainless steel 254SMo, the welded test plate is processed according to the sample size requirement of corresponding detection standard, with American Bureau of Shipping (ABS) material and welding specification as guidance document, Check the following items, see the table below:

[0102]

[0103]

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Abstract

The invention relates to the field of welding technology, in particular to a plasma welding process of austenitic stainless steel 254SMo with bypass wire feeding, comprising the following process steps: (1) steel plate cutting, (2) welding wire selection, (3) steel plate pretreatment , (4) splicing and positioning of steel plates, (5) installing back protection tooling, (6) filling back protection gas, (7) welding; the welding process parameters are: the polarity of the power supply of the plasma arc welding equipment is DC positive, and the plasma The tungsten electrode type of the arc welding torch is cerium tungsten electrode WCe‑20, with a diameter of φ4.0mm; the back shielding gas, welding front shielding gas, plasma gas, and drag mask gas all use argon gas with a purity level of 99.99%; the plasma gas flow rate is 5.5 ~6.0L / min, the flow rate of welding front shielding gas and dragging gas is 25~30L / min, welding current 210~230A, voltage 26~28V, welding speed 20~22cm / min, heat input 0.89‑1.16KJ / mm. The invention improves the welding efficiency, reduces the production cost and improves the welding quality at the same time.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a plasma welding process of austenitic stainless steel 254SMo with bypass wire feeding. Background technique [0002] Super austenitic stainless steel 254SMo (UNS S31254), as the main material for desulfurization tower construction, has strong resistance to pitting corrosion, crevice corrosion, chloride ion stress corrosion and intergranular corrosion resistance, especially for acid radicals such as sulfate ions and chloride ions Ions have good corrosion resistance and can be used in extremely harsh working environments, so super austenitic stainless steel is more and more widely used. [0003] In the prior art, the welding process for the above-mentioned super austenitic stainless steel 254Smo mainly adopts electrode arc welding (SMAW), submerged arc welding (SAW), and manual argon arc welding (TIG). Hot crack defects. Especially for the welding of medium and thick-walled sup...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K10/02B23K37/02B23K103/04
CPCB23K10/022B23K37/0252B23K2103/04
Inventor 陈日昱周军王浩浩
Owner CHENGXI SHIPYARD XINRONG
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