Stainless steel sheet welding method capable of preventing weld cracks

A welding method and technology of weld cracks, which are applied in the field of welding stainless steel sheets, and can solve problems such as welding cracks and scrapping of weldments

Active Publication Date: 2012-02-22
TANGSHAN CAOFEIDIAN DISTRICT SHOUYAN MACHINERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Residual stress leads to welding hot cracks and cold cracks. The brittle failure is most likely to occur in welding, which often leads to welding cracks and a large number of weldments are scrapped.

Method used

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  • Stainless steel sheet welding method capable of preventing weld cracks
  • Stainless steel sheet welding method capable of preventing weld cracks
  • Stainless steel sheet welding method capable of preventing weld cracks

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The tank body of a product is welded by stainless steel plate (material 304L) with a thickness of 6mm and a length of 1.5-1.8m, and the length of the fillet weld is 2.2m. Multiple ribs are set in the tank, and flanges or socket frames are set at both ends, and the structure is relatively complicated. The maximum length of the steel plate required for the stainless steel box can reach 6m, and the height is 2.2m. A large number of straight welds and fillet welds are required, because the tank in the working state is filled with high-temperature alkaline media, which has a high airtightness for welding. requirements.

[0024] The following steps and process parameters are used to make:

[0025] 1) Process a groove on a stainless steel sheet to be welded, the groove cutting angle α is 15°, the uncut thickness d is 1 / 3t, and the gap h between the other stainless steel sheet to be welded is 1 / 3t, Where t is the thickness of the welded stainless steel sheet;

[0026] 2) Wip...

Embodiment 2

[0035] The product type is the same as in Example 1, the material of the stainless steel sheet is 304L, the thickness is 8mm, the welding length is 6m, and the height is 2.2m.

[0036] The following steps and process parameters are used to make:

[0037] 1) A groove is processed on a stainless steel sheet to be welded, the groove cutting angle α is 30°, the uncut thickness d is 1 / 2t, and the gap h between the other stainless steel sheet to be welded is 1 / 2t, Where t is the thickness of the welded stainless steel sheet;

[0038] 2) Wipe the processed surface of the stainless steel sheet to be welded with welding ketone to remove the oil stain on the surface; preheat the welding place to 80-120°C;

[0039] 3) After splicing the two stainless steel sheets to be welded, perform spot welding at intervals of 100mm, keep the positions of the two welded sheets fixed, and keep the gap between them even;

[0040] 4) Use the mixed gas of carbon dioxide and argon as the active shielding...

Embodiment 3

[0047] The product type is the same as in Example 1, the material of the stainless steel sheet is 304L, the thickness is 6mm, the welding length is 6m, and the height is 2.2m.

[0048] The following steps and process parameters are used to make:

[0049] 1) Process a groove on a stainless steel sheet to be welded, the groove cutting angle α is 20°, the uncut thickness d is 1 / 3t, and the gap h between the other stainless steel sheet to be welded is 1 / 3t, Where t is the thickness of the welded stainless steel sheet;

[0050] 2) Wipe the processed surface of the stainless steel sheet to be welded with welding ketone to remove the oil stain on the surface; preheat the welding place to 80-120°C;

[0051] 3) After splicing the two stainless steel sheets to be welded, perform spot welding at intervals of 100mm, keep the positions of the two welded sheets fixed, and keep the gap between them even;

[0052] 4) Use the mixed gas of oxygen or carbon dioxide and argon as the active shie...

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Abstract

The invention discloses a stainless steel sheet welding method capable of preventing weld cracks. The method comprises the following steps: preheating a welding place to 80-120 DEG C; melting the surface of a welding bead to be welded by using moderate current tungsten electrode arc; with oxygen or mixed gas of carbon dioxide and argon as active protection gas, performing welding according to thefollowing set technological parameters after a molten pool is formed: welding current I: 115-125A, welding speed V: 110-125 mm / min, arc length L: 4 mm, and flow Q of active protection gas: 14L / min; controlling the length L of a welding seam of each welding rod with length L1 to be in a range that L is not less than 0.75L1 and not larger than L1; and in the welding process, hanging the U-shaped cooper pipes filled with cooling water on the two sides of the welding seam so as to accelerate the cooling of the welding seam while welding. In the invention, by controlling the welding preheating temperature and adding a welding cooling assistant device, the aim of controlling cracks is achieved.

Description

Technical field: [0001] The invention relates to an automatic welding method for large stainless steel thin plates, in particular to a welding method for stainless steel thin plates that can prevent welding seam cracks. Background technique: [0002] Since the welding process of stainless steel tank is carried out in the local area of ​​the weldment, this local uneven heating and cooling process leads to extremely uneven distribution of the welding temperature field, a large range of temperature changes, and accompanied by phase transitions, so that Various parts of the weldment have different degrees of expansion and contraction, which inevitably produces complex welding residual stress. Residual stress leads to brittle failure of welding hot cracks and cold cracks, which is most likely to occur in welding, which often leads to welding cracks and a large number of weldments are scrapped. During the inspection of the welded joints of the stainless steel tank, the inspectors...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/167B23K9/235B23K9/32
Inventor 蒲存虎赵丽琴连广东崔海燕
Owner TANGSHAN CAOFEIDIAN DISTRICT SHOUYAN MACHINERY CO LTD
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