Welding technology for large connecting cylinder

A welding process and connecting cylinder technology, which is applied in the welding process field of large-scale connecting cylinders for ships, can solve the problems of high welding heat, slag inclusion in weld seam, deformation of weldment, etc., and achieve the effect of no slag inclusion deformation

Inactive Publication Date: 2013-03-27
SOUTH CHINA MARINE MACHINERY
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  • Claims
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Problems solved by technology

The above-mentioned welding method can only be used for the welding of small connecting cylinders. For example, when it is used for the welding of large connecting cylinders for ships, because the welding depth is too deep and the welding heat is large, it is easy to cause slag inclusion in the weld seam, and the weldment is seriously damaged. Deformation and other issues

Method used

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  • Welding technology for large connecting cylinder
  • Welding technology for large connecting cylinder
  • Welding technology for large connecting cylinder

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Embodiment Construction

[0012] Embodiments of the present invention will be further described below in conjunction with accompanying drawings:

[0013] figure 1 The large-scale flange welding method shown includes the following steps: step 101: blanking the flange in sections; step 102: opening the splicing groove; step 103: assembling the flange; step 104: welding in batches; step 105: Grinding and root cleaning; Step 106: Ultrasonic flaw detection; Step 107: Cylinder sheet blanking; Step 108: Splicing groove; Step 109: Cylinder roll forming; Step 110: Welding in stages; Step 111: Grinding and root cleaning ;Step 112: Ultrasonic flaw detection; Step 113: Double roller shaping and surface seam of the barrel; Step 114: Overall assembly; Step 115: Segmented and symmetrical desoldering; stress relief. The specific implementation method is as follows:

[0014] figure 2 The large connecting cylinder includes a cylinder 1 welded with two flanges 2 on the upper and lower end surfaces of the cylinder 1,...

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Abstract

The invention discloses a welding technology for a large connecting cylinder. The welding technology comprises the following steps of dividing a large flange material into a plurality of small sections for blanking and opening a splicing groove, and then forming a flange shape; welding at each butt joint front and back by several times; polishing and cleaning a welded seam after welding each time; carrying out ultrasonic detection on all welded seams after welding; carrying out blanking on a panel and opening the splicing groove on the panel according to the shape of the cylinder and molding through rolling; welding at the butt joint front and back by several times, polishing and cleaning the butt joint and carrying out ultrasonic detection on the butt joint, then reshaping the cylinder by rolling again and seaming the side of the cylinder; and finally, splicing the two welded flanges at the upper end surface and the lower end surface of the cylinder for integral splicing, and removing welding stress of a whole welded piece. Compared with the prior art, the welding technology solves the problems that the welded seam is easy to have residues and the welded pieces are deformed too much when the traditional ordinary welding method for the connecting cylinder is used for welding large flanges.

Description

technical field [0001] The invention relates to the technical field of ship machinery manufacturing, in particular to a welding process method for large-scale connecting cylinders used in ships. Background technique [0002] The traditional flange welding methods include: firstly, blanking and beveling on one side; then assembling the lowered materials together and fixing them by spot welding; welding at one time after spot welding; grinding with grinding wheels after welding; Visually inspect the quality of welds; repair welding in time if problems are found; and finally conduct ultrasonic flaw detection and other steps. The above-mentioned welding method can only be used for the welding of small connecting cylinders. For example, when it is used for the welding of large connecting cylinders for ships, because the welding depth is too deep and the welding heat is large, it is easy to cause slag inclusion in the weld seam, and the weldment is seriously damaged. problems suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K31/02B23P15/00
Inventor 罗志强
Owner SOUTH CHINA MARINE MACHINERY
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