Box -type supporting part panel welding molding method

Abstract

The invention discloses a welding forming method of box-type support element panels, and the method has the characteristic of alleviating welding deformation. The welding forming method of the box-type support element panels comprises the following steps: a. grinding the bonding regions, on which ceramic gaskets are required to be bonded, of the panels and vertical plates, clearing impurities on the bonding regions, and then sintering the bonding regions for removing water vapor; b. bonding the ceramic gaskets on the vertical plates; c. covering the upper surfaces of the ceramic gaskets with the panels, wherein single-surface-welding dual-surface-forming welding grooves are formed between the panels and the vertical plates, the upper parts of the grooves are single-surface U-shaped grooves, the lower parts of the grooves are single-surface V-shaped grooves, the angle alpha of each single-surface V-shaped groove is equal to 30 degrees, the clearance a between the truncated edge of each groove and the corresponding vertical plate is more than or equal to 6mm and less than or equal to 8mm, and the size h of the truncated edge of each groove is more than or equal to 2mm and less than or equal to 3mm; d. preheating the panels and the vertical plates; and e. performing flux-cored wire gas shielded welding on the panels and the vertical plates at the grooves. The shrinkage deformation during welding can be controlled effectively.

Description

technical field [0001] The invention relates to a welding method, in particular to a welding forming method for a panel of a box-shaped support that can effectively control the internal space distance of the box-shaped support when welding the box-shaped support. Background technique [0002] The heavy support of Sanmen / Haiyang Nuclear Power Plant belongs to the third-generation AP1000 nuclear power support. It is the first set of third-generation nuclear power support in the world. It is very different from the previous nuclear power support. There is no experience to learn from. The support structure is a box structure, the specific structure is as follows figure 1 and figure 2 shown. [0003] The support mainly has the following difficulties in the production process: [0004] 1. The product requires high dimensional accuracy and is very strict on welding deformation, and the entire support structure is not conducive to controlling deformation. It is extremely difficu...

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Problems solved by technology

[0005] 2. Ultrasonic flaw detection is required for all welds of this product. It is a box-shaped structure with a small internal space. figure 2 As shown, the space between the front and back panels 1 after welding and the internal workpiece 8 is only 54mm, and the root cleaning and welding of the back cannot be realized, so the single-side welding and double-side forming welding method can only be selected to ensure the quality of the weld seam extremely difficult

[0006] 3. The product of this project requires 100% MT flaw detection after the weld is primed. Due to the high welding stress of the closed weld, it is easy to cause root cracking

[0007] 4. The current domestic manufacturing technology for this project is not yet mature, and many temporary and unexpected problems will be encountered in production

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