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Assembly method of positioning chock for ensuring gap at root parts butt jointing tubes in use for welding

A technology of root clearance and butt joints, applied in welding equipment, auxiliary welding equipment, welding/cutting auxiliary equipment, etc., can solve the problems of base material damage on both sides of the groove, insufficient positioning rigidity, and difficulty in ensuring assembly clearance, etc., to achieve Easy operation for fixing removal, improved welding quality, and remarkable positioning effect

Active Publication Date: 2005-11-16
渤海造船厂集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem is that the rigidity is not enough, the assembly clearance cannot be guaranteed, and it is easy to cause damage to the base metal on both sides of the groove
The problem is that there are too many joints at the root, the positioning rigidity is not enough, and the assembly clearance cannot be guaranteed, so the welding quality cannot be guaranteed
The method is easy to damage the groove, the welding wire is in point contact with the edge of the groove, the positioning rigidity is insufficient, the assembly clearance is difficult to ensure, there are too many welding joints, and the quality of the root root weld cannot be guaranteed.

Method used

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  • Assembly method of positioning chock for ensuring gap at root parts butt jointing tubes in use for welding
  • Assembly method of positioning chock for ensuring gap at root parts butt jointing tubes in use for welding
  • Assembly method of positioning chock for ensuring gap at root parts butt jointing tubes in use for welding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The assembly method for ensuring the root clearance of pipe butt joints with positioning plugs for welding, including:

[0031] According to the pipe wall thickness δ=16mm, U-shaped groove can be used according to δ>15mm in Table 1 (see Figure 5 ), the joints of the two pipes are respectively processed into U-shaped grooves 1, the U-shaped groove 1 groove face angle β is 16°, and the root blunt edge P is 2.2mm;

[0032] The pipe is made of stainless steel, and the same material as the pipe is used to process the positioning plug 2 with the same size as the cross-section of the U-shaped groove 1;

[0033] According to the larger diameter of the pipe, four positioning plugs 2 are used for positioning, and the four positioning plugs 2 are arranged along the U-shaped bevel 1 of the pipe circumference in quarters, and the positioning plugs 2 are connected with the U-shaped grooves of the two pipe joints. The two sides of the groove 1 are fixed by argon tungsten arc welding...

Embodiment 2

[0036] The assembly method for ensuring the root clearance of pipe butt joints with positioning plugs for welding, including:

[0037] According to the pipe wall thickness δ=10mm, V-shaped groove can be used according to 3≤δ≤15m in Table 1 (see Figure 6 ), respectively process V-shaped grooves 4 at the butt joints of the two pipes, the included angle of the V-shaped grooves 4 is 60°, and the blunt edge P of the root is 1mm;

[0038] The pipe is made of stainless steel, and the same material stainless steel is used to process the positioning plug 5 with the same size as the cross-section of the V-shaped groove 4;

[0039] According to the small diameter of the pipe, three positioning plugs 5 are used for positioning, and the three positioning plugs 5 are arranged along the V-shaped bevel 4 of the pipe circle in three equal positions, and the positioning plugs 5 are connected with the outer circles of the two pipe joints. It is fixed by argon tungsten arc welding spot welding,...

Embodiment 3

[0042] The assembly method for welding the positioning plug to ensure the root gap of the pipe butt joint, including:

[0043] According to the pipe wall thickness δ=2.5mm, I-shaped groove can be used according to δ Figure 7 ), respectively process I-shaped grooves 7 at the butt joints of the two pipes;

[0044] The pipe material is copper-nickel alloy, and the same material copper-nickel alloy is used to process the positioning plug 8 with the same size as the section of the I-shaped groove 7;

[0045] According to the small diameter of the pipe, two positioning plugs 8 are used for positioning. Argon tungsten arc welding is fixed by spot welding, and the spot welding fixed weld seam 9 is 10mm long, ensuring that the root gap b=2mm meets the requirements of the process b=3±1mm;

[0046] Manual argon tungsten arc welding is used, starting from one point in order to weld the bottom weld seam, and welding to the positioning plug 8, and the spot welding fixed weld seam 9 at this...

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Abstract

A method for arranging the locating block to ensure the welding gap between two pipes to be buttwelded includes choosing the shape of groove accoring to the tickness of pipe wall, machining the groove, and welding several locating blocks between two grooves of two pipes by dot welding.

Description

(1) Technical field [0001] The invention relates to a welding process method, in particular to an assembly method for a positioning plug used for welding to ensure the gap at the root of a pipe butt joint. (2) Background technology [0002] The lateral expansion or contraction deformation of the joint root during the welding process directly affects the quality of the bottoming weld at the root of the butt joint. Especially when welding materials with large coefficient of linear expansion (such as stainless steel, nickel-based alloys, copper-based alloys, etc.) at the root of the joint, the lateral shrinkage deformation of the joint root can reach 2-3 mm, which cannot guarantee the single-sided welding and double-sided forming process. In order to achieve single-sided welding and double-sided forming, it is necessary to maintain an assembly gap at the root of the joint during the welding process. How to ensure the assembly clearance at the root of the joint has become the k...

Claims

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Application Information

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IPC IPC(8): B23K37/04
Inventor 刘殿宝陈凯朱元臣刘放王长河雷兆峰高峰王熹哲赵振民
Owner 渤海造船厂集团有限公司
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