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Method for combined welding of austenitic stainless steel moderate thickness plate

A technology of austenitic stainless steel and welding method, used in welding equipment, welding/welding/cutting items, manufacturing tools, etc., can solve the problem of inability to guarantee the back side of the weld, unstable quality of welded joints, and difficulty in achieving stainless steel penetration, etc. problems, to prevent heat accumulation, no cracks and undercut defects, and the process is simple and easy to implement.

Inactive Publication Date: 2015-08-26
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this technology, the copper backing needs to be removed before the cover welding on the root pass can be performed. The process is cumbersome, and root welding, cover welding and back welding cannot be performed at the same time.
In addition, it is difficult to achieve the penetration of the stainless steel medium and thick plate in the base welding of argon tungsten arc welding, and the formation of the back of the weld cannot be guaranteed, and the quality of the welded joint obtained by manual operation is unstable

Method used

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  • Method for combined welding of austenitic stainless steel moderate thickness plate
  • Method for combined welding of austenitic stainless steel moderate thickness plate
  • Method for combined welding of austenitic stainless steel moderate thickness plate

Examples

Experimental program
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Effect test

Embodiment 1

[0037] 304 austenitic stainless steel plate 2 with a thickness of 10mm, the test plate size is 180mm×160mm×12mm, its chemical composition is C 0.06%, Si 0.40%, Mn 1.62%, P 0.026%, S 0.012%, Ni 8.14%, Cr 18.03%, Fe balance.

[0038] (1) Preparation before welding

[0039] like figure 1As shown, the butt joint of the test plate to be welded is machined with a V-shaped groove 1, the angle of the V-shaped groove 1 is 60°, each side is 30°, and the blunt edge is 7mm. Use an electric angle grinder to grind the surface of the workpiece to be welded and the groove to remove burrs, oil stains and scales, and clean the groove and the surface of the workpiece with acetone and absolute ethanol in turn. Use fixtures to tightly assemble and fix the workpiece without gaps, and use manual tungsten argon arc welding to fix the arc starting plate, arc extinguishing plate and spot welding between the test plates. German IDA Hi-Tech EWM-422 pulse plasma arc welding machine and WSM-400 inverter...

Embodiment 2

[0047] A 304L strain-strengthened austenitic stainless steel plate with a thickness of 12mm, its chemical composition is C 0.03%, Si 0.50%, Mn 1.60%, P 0.024%, S 0.014%, Ni 11.00%, Cr 19.80%, Fe balance, try The plate size is 160mm x 130mm x 12mm. The EWM-422 pulse plasma arc welding machine and WSM-400 inverter pulse argon arc welding machine are selected from Germany.

[0048] (1) Preparation before welding

[0049] Use a lathe to process a V-shaped groove at the butt joint of the test plate to be welded. The groove angle is 60°, each side is 30°, and the blunt edge is 8mm. Use an electric angle grinder to grind the surface of the workpiece to be welded and the groove to remove burrs, oil stains and scales, and clean the groove and the surface of the workpiece with acetone and absolute ethanol in turn. Use fixtures to tightly assemble and fix the workpiece without gaps, and use manual tungsten argon arc welding to fix the arc starting plate, arc extinguishing plate and spo...

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Abstract

The invention relates to a method for combined welding of an austenitic stainless steel moderate thickness plate. The method comprises the steps of opening a V-shaped groove at the position of the to-be-welded butt joint surface of austenitic stainless steel; polishing and cleaning the surface of a to-be-welded workpiece and the position of the V-shaped groove; performing gapless tight fixed assembly of the workpiece, performing spot welding fixation on a run-on plate, an arc blowout plate and a test plate; pre-leading in protective gas prior to butt welding, guaranteeing that sufficient protective atmosphere is formed on the surface of the stainless steel groove and the bottoms of the weld joints; adopting pulsed plasma arc welding to perform bottoming welding; adopting low carbon welding wires to perform cosmetic welding of pulse wire filling argon tungsten-arc welding, performing the bottoming welding of the pulsed plasma arc welding and cosmetic welding of the pulse wire filling argon tungsten-arc welding simultaneously, and cooling the workpiece while performing the welding. The PC-PAW bottoming welding is adopted, the micropore effect is utilized to achieve one-side welding and double-sided free forming of the moderate thickness plate, the backs of the weld joints are smoothly formed and are free of cracks and edge snapping defects, the process is stable and easy to achieve, and the quality is reliable.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a combined welding method for austenitic stainless steel medium and thick plates. Background technique [0002] At present, the demand for stainless steel in production and manufacturing is increasing day by day, especially the welded structure of stainless steel plate is playing an increasingly important role in the fields of transportation pipelines, container storage tanks, shipbuilding and nuclear power construction. However, austenitic stainless steel is particularly sensitive to welding heat input, which can easily cause severe intergranular corrosion, and it is difficult to perform high-efficiency welding under high heat input. The traditional combined welding method of argon tungsten arc welding + manual arc welding needs to After cooling, the subsequent welding seam is welded, resulting in low production efficiency, high consumption of welding materials, hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K31/02
CPCB23K31/02B23K2103/04
Inventor 李亚江刘坤王娟
Owner SHANDONG UNIV
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