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Process method for rewelding of high strength steel

A process method and high-strength steel technology, applied in the direction of manufacturing tools, welding equipment, welding equipment, etc., can solve the problems of difficult preheating work, poor working environment, and low work efficiency, so as to improve the quality and production efficiency of rework welding, shorten Heating time and energy saving effect

Inactive Publication Date: 2009-10-21
WUCHUAN HEAVY ENG
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AI Technical Summary

Problems solved by technology

[0003] According to relevant regulations, the preheating temperature of high-strength steel rework welding needs to be around 200°C. To keep the rework weld zone of large-thick plate high-strength steel structural parts stable at around 200°C for a long time, it is necessary to ensure that the welded components are welded within a large enough area. Fully fully heated to the required preheating temperature can effectively prevent rapid heat conduction, which will cause problems such as low work efficiency and poor working environment, especially in outdoor construction. When the ambient temperature is low, the cooling speed is fast and preheating The effect is poor, the instantaneous temperature of the flame heating point can reach the preheating temperature requirement, and after a few minutes of evacuation of the heat source, the temperature in this area will drop below the required preheating temperature, and the preheating work before welding is more difficult

Method used

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  • Process method for rewelding of high strength steel
  • Process method for rewelding of high strength steel
  • Process method for rewelding of high strength steel

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Experimental program
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specific Embodiment 1

[0018] like figure 1 , figure 2 As shown, the fillet welding between the high-strength steel plate 3 and the high-strength steel plate 4, the specific repair process is:

[0019] Remove all weld defects and extend them to 10-15mm outside the two ends of the crack to form reworked weld grooves 1 and 2 suitable for welding, and use a grinder to grind the reworked weld grooves 1 and 2 and the surrounding areas to reveal metallic luster;

[0020] Sufficiently heat the reworked weld seam suitable for welding within the range of 500mm on each side of groove 1 and 2, and the temperature is 80-90°C;

[0021] Before welding the reworked weld groove 1 that is suitable for welding, the position of the welding spot 11 corresponding to the weld groove 1 on the back of the high-strength steel plate 4, that is, the weld 2, is continuously heated so that the corresponding weld groove 1 is welded. The local preheating temperature of the solder joint before welding is 200±20°C;

[0022] Usi...

specific Embodiment 2

[0025] like image 3 , Figure 4 As shown, the high-strength steel plate 7 and the high-strength steel plate 8 are butt welded, and the specific repair process is:

[0026] Remove all weld defects and extend to 10-15mm outside the two ends of the crack to form reworked weld grooves 5 and 6 suitable for welding, and use a grinder to grind the reworked weld grooves 5 and 6 and the surrounding areas to reveal metallic luster;

[0027] Fully heat the reworked weld grooves within 500mm on each side of grooves 5 and 6 at a temperature of 80-90°C;

[0028] Before welding the reworked weld groove 5 that is suitable for welding, the position of the welding spot 15 on the back of the high-strength steel plate 7 and 8, that is, the weld 6 corresponding to the weld groove 5, is continuously heated, so that the corresponding weld groove 5 The local preheating temperature before welding of the upper welding spot 15 is 200±20°C;

[0029] Using CO 2 Gas shielded welding is used for rework...

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Abstract

The invention relates to the field of rewelding technology of high strength steel and provides a process method for rewelding of high strength steels. The process method comprises the following working steps of firstly heating to a lower pre-heating temperature within a larger range at a welding groove, suitably reducing the temperature gradients and additive stress of the component, subsequently when in welding, heating centrally and continuously within a small range at the positions corresponding to the back surface of the welding positions simultaneously, and maintaining local high pre-heating temperature before welding. The process method can effectively improve the heat utilization ratio of weld pre-heating of the large thickness plate steel components, save the energy resource and improve the rewelding quality and production efficiency.

Description

technical field [0001] The invention relates to the technical field of high-strength steel welding, in particular to a rework welding process for high-strength steel. Background technique [0002] High-strength steel welding usually requires pre-welding pre-heating to improve welding heat cycle conditions and prevent welding cracks. The required pre-heating temperature depends on the chemical composition of the base metal, joint restraint, welding method, ambient temperature and other factors. Especially in the rework welding of high-strength steel, due to the three-dimensional stress of the weld, the degree of restraint is large, and a higher preheating temperature is required than normal product welding. [0003] According to relevant regulations, the preheating temperature of high-strength steel rework welding needs to be around 200°C. To keep the rework weld zone of large-thick plate high-strength steel structural parts stable at around 200°C for a long time, it is neces...

Claims

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Application Information

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IPC IPC(8): B23K37/00C21D3/06B23K9/025B23K9/23B23K9/235B23K9/16
Inventor 张华舒先庆叶君龙邹莉莎
Owner WUCHUAN HEAVY ENG
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