Argon arc welding process of a super austenitic stainless steel 254smo steel pipe

A technology of austenitic stainless steel and welding technology, applied in welding equipment, welding equipment, welding accessories, etc., can solve problems affecting the performance of welded joints, intergranular chromium deficiency, intergranular corrosion, etc., and achieve excellent resistance to stress corrosion cracking Effects on performance, churn reduction, improved performance and quality

Active Publication Date: 2021-07-20
CHENGXI SHIPYARD XINRONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the butt welding of stainless steel 254SMo steel pipes, since the welded joints are in the process of rapid continuous heating during the welding process, the heat-affected zone in the sensitized zone (450-850°C) is likely to cause intergranular chromium depletion, so it is easy to produce intergranular corrosion. thereby affecting the performance of the welded joint

Method used

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  • Argon arc welding process of a super austenitic stainless steel 254smo steel pipe
  • Argon arc welding process of a super austenitic stainless steel 254smo steel pipe
  • Argon arc welding process of a super austenitic stainless steel 254smo steel pipe

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Effect test

Embodiment 1

[0048] Such as Figures 1 to 3 Shown is the embodiment of the argon arc welding process of a kind of super austenitic stainless steel 254SMo steel pipe of the present invention, comprises following process steps:

[0049] (1) Steel pipe cutting and blanking: 254SMo stainless steel pipes are used, which are cut and formed according to the design requirements;

[0050] (2) Selection of welding wire: use AWSA5.14: ERNiCrMo-3, welding wire with a diameter of φ2.4mm;

[0051] (3) Selection and setting of welding equipment: use TIG welding machine and matching TIG welding torch, set the polarity of the power supply to DC positive connection, the type of tungsten electrode of the TIG welding torch is cerium tungsten electrode WCe-20, and the diameter is φ2.4mm; TIG welding torch The nozzle uses a nozzle with an inner diameter of 16mm;

[0052] (4) Groove preparation: make a welding groove at the butt joint of the stainless steel pipe, the welding groove adopts a butt V-shaped groov...

Embodiment 2

[0077] Adopt the welding process of embodiment 1, carry out the butt welding test of super austenitic stainless steel 254SMo steel pipe, the welding sample is processed according to the sample size requirement of corresponding inspection standard, with American Bureau of Shipping (ABS) material and welding specification as guidance Documents, the following items are tested, see the table below:

[0078]

[0079]

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Abstract

The invention discloses an argon arc welding process for a super austenitic stainless steel 254SMo steel pipe, including steel pipe cutting and blanking, welding wire selection, welding equipment selection and setting, groove preparation, steel pipe pretreatment, steel pipe splicing and positioning, installation back Protective tooling, filling back shielding gas, welding process steps, the back shielding gas is 90% nitrogen + 10% hydrogen, the welding front shielding gas is 98% argon + 2% nitrogen, the welding sequence includes TIG priming, Filling and covering; TIG welding current 70‑80A, voltage 12‑13V, welding speed 5.5‑6.0cm / min, heat input 0.50‑0.68KJ / mm; TIG filling welding current 90‑100A, voltage 12‑13V, welding speed 5.5‑6.0cm / min, heat input 0.65‑0.94KJ / mm; TIG cover welding current 95‑105A, voltage 12‑13V, welding speed 7.0‑8.0cm / min, heat input Amount of 0.51‑0.70KJ / mm; interlayer temperature is less than 100 degrees Celsius. The invention improves the welding quality of the 254SMo steel pipe.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to an argon arc welding process for a super austenitic stainless steel 254SMo steel pipe. Background technique [0002] Super austenitic stainless steel pipe 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 sulfate ions, chloride ions, etc. Acid ions have good corrosion resistance and can be used in extremely harsh working environments, so super austenitic stainless steel pipe 254SMo (UNS S31254) is more and more widely used. [0003] At present, the methods of electrode arc welding (SMAW) and flux-cored wire gas shielded welding (FCAW) have been applied, but the consumption of welding materials is large, the welding shape is poor, the deformation is large, and the generation of welding spatter causes the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/167B23K9/28B23K9/32B23K37/04B23K101/06B23K103/04
CPCB23K9/167B23K9/287B23K9/325B23K37/0426B23K2101/06B23K2103/05
Inventor 陈伯存陈日昱徐军峰
Owner CHENGXI SHIPYARD XINRONG
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