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

A root gap and butt joint technology, applied in welding equipment, auxiliary welding equipment, welding/cutting auxiliary equipment, etc., can solve problems such as difficulty in ensuring assembly clearance, damage to the base material on both sides of the groove, and insufficient positioning rigidity, etc., to achieve Significant positioning effect, easy removal of fixation, and improved welding quality

Active Publication Date: 2008-06-04
中国船舶集团渤海造船有限公司
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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

[0031] The assembly method for ensuring the root clearance of pipe butt joints with positioning plugs for welding, including:

[0032] According to the pipe wall thickness δ=16mm, U-shaped groove can be used according to δ>15mm in Table 1 (see Figure 5), and the U-shaped groove 1 is processed at the joint of the two pipes, and the U-shaped groove 1 groove surface Angle β is 16°, root blunt edge P is 2.2mm;

[0033] 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;

[0034] 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 spot welding...

Embodiment 2

[0037] The assembly method for ensuring the root clearance of pipe butt joints with positioning plugs for welding, including:

[0038] According to the pipe wall thickness δ=10mm, V-shaped grooves can be used according to 3≤δ≤15m in Table 1 (see Figure 6), and V-shaped grooves 4 are processed at the joints of the two pipes, and the V-shaped grooves 4 The included angle is 60°, and the blunt edge P at the root is 1mm;

[0039] 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;

[0040] 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 upper thirds of the V-shaped groove 4 of the pipe circle, and the positioning plugs 5 are aligned with the outer circles of the two pipe joints It is fixed by argon tungsten arc welding spot welding, and the spot w...

Embodiment 3

[0043] The assembly method for ensuring the root clearance of pipe butt joints with positioning plugs for welding, including:

[0044] According to the pipe wall thickness δ=2.5mm, I-shaped grooves can be used according to δ<3mm in Table 1 (see Figure 7), and I-shaped grooves 7 are processed at the joints of the two pipes;

[0045] 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;

[0046] According to the small diameter of the pipe, two positioning plugs 8 are used for positioning, and the two positioning plugs 8 are arranged in half along the I-shaped groove 7 of the pipe circumference, and the positioning plugs 8 and the outer circles of the two pipe joints are used. Argon tungsten arc welding is fixed by spot welding, and the fixed welding seam 9 of the spot welding is 10mm long, ensuring that the root gap b=2mm meets the requirements of t...

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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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Patent Type & Authority Patents(China)
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 中国船舶集团渤海造船有限公司
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