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A 304 stainless steel submerged arc welding welding process

A 304 stainless steel, welding process technology, applied in welding equipment, arc welding equipment, welding/welding/cutting items, etc., can solve the problems of excessive welding residual deformation of components, large residual stress and residual deformation, and large thermal expansion coefficient. Achieve the effect of excellent welding process performance, less burning loss and beautiful appearance

Active Publication Date: 2022-07-26
THE 14TH METALLURGICAL CONSTR GRP YUNNAN INSTALLATION ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 3. Residual stress and deformation: Due to the particularity of the physical properties of 304 stainless steel (small thermal conductivity, large thermal expansion coefficient, etc.), compared with general structural steel, it is prone to greater stress and deformation during welding. Therefore, The residual stress and residual deformation after welding are also relatively large, resulting in excessive welding residual deformation of components

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The concrete welding process of the present invention comprises the following steps:

[0031] S1. Clean the welding side. Use oxalic acid to clean both sides of the weld before welding to remove oil and rust and other contaminants;

[0032] S2, back root cleaning, before back welding, use an angle grinder to clean the back of the weld;

[0033] S3. Welding groove selection, using the joint form of plate butt and "I" type welding groove;

[0034] S4, the welding seam is paired, the amount of misalignment shall not be greater than 0.5mm when forming a team, and the welding seam gap is 1mm. The tack welding should be welded as far as possible where the gap is greater than 1mm, or it can be slightly longer (reaching or exceeding 100mm), which can not only ensure that the wrong side will not occur under the condition of large stress during welding, but also ensure that the welding will not occur when the gap is large. burn through. During team formation and tack welding, ...

Embodiment 2

[0039] The second embodiment is basically the same as the first embodiment, except that the welding current of the front welding layer is 390A, the arc voltage is 31V, the welding speed is 500mm / min, the welding current of the back welding layer is 430A, and the arc voltage is 34V, the welding speed is 500mm / min.

Embodiment 3

[0041] The third embodiment is basically the same as the first embodiment, except that the welding current of the front welding layer is 400A, the arc voltage is 32V, the welding speed is 500mm / min, the welding current of the back welding layer is 450A, and the arc voltage is 35V, the welding speed is 500mm / min.

[0042] To sum up, the welding process adopted in the present invention reduces the input of welding heat, and the determined reasonable welding sequence can further reduce the stress during the welding process and the residual stress and residual deformation after welding, and improve the welding strength. Using HO8Cr21Ni10Si stainless steel wire and F308 (HJ260) flux, submerged arc welding of 304 austenitic stainless steel has the characteristics of no increase of C and less burning loss of Si, Cr and Ni elements, excellent welding process performance, easy slag removal, welding Beautifully stitched. The appearance inspection after welding shows that the gauge seam...

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Abstract

The invention discloses a 304 stainless steel submerged arc welding welding process, which relates to the field of welding. The process is as follows: the 304 stainless steel weldment to be welded is in the form of a plate butt joint, and the "I" type welding groove is used. The front and back sides of the weldment at the corresponding welding seam use a diameter of 4mm and a type of H08Cr21Ni10Si welding wire Weld by submerged arc welding. Among them, the welding current of the front welding layer is 380-400A, the arc voltage is 30-32V, the welding speed is 500mm / min, the welding current of the back welding layer is 420-450A, the arc voltage is 33-35V, and the welding speed is 500mm / min. The welding process adopted in the invention reduces the input of welding heat, and the determined reasonable welding sequence can further reduce the stress during the welding process and the residual stress and residual deformation after welding, and improve the welding strength. The appearance inspection after welding shows that the gauge seam has beautiful appearance, smooth wave passing, and no defects such as cracks, undercuts, incomplete fusion, and slag inclusions on the surface. The non-destructive testing shows that the internal quality of the weld is good and it is a qualified weld.

Description

technical field [0001] The invention relates to the technical field of 304 stainless steel welding, in particular to a 304 stainless steel submerged arc welding welding process. Background technique [0002] The chemical grade of 304 stainless steel is 06Cr19Ni10, containing 19% of chromium and 8-10% of nickel. It is the most widely used stainless steel at present. It has good corrosion resistance, heat resistance, low temperature strength and mechanical properties, as well as good processing performance and weldability. , the allowable use temperature is -196 ℃ - 800 ℃, used in food equipment, general chemical equipment, nuclear energy and so on. Due to the low thermal conductivity, low melting point and high coefficient of linear expansion of 304 austenitic stainless steel, under the same welding process parameters, when heated to above 600°C, the weld metal stays at high temperature for a long time, and it is easy to form a cast structure and produce large The welding st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/18B23K9/235B23K9/02
CPCB23K9/18B23K9/235B23K9/02B23K2103/05
Inventor 刘晓伟魏东孟凡国赵艳红施林鹏李超
Owner THE 14TH METALLURGICAL CONSTR GRP YUNNAN INSTALLATION ENG CO LTD
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