Method for welding cut surface butt joint formed by thin welding base materials

A technology of butt joint and base metal, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of high welding cost, incomplete penetration, and long welding cycle.

Active Publication Date: 2012-10-03
CHINA NUCLEAR IND 23 CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems in the prior art that the pipe machining cycle and welding cycle are long, the welding cost is high, and there is a risk of incomplete penetration in the local area, the present invention proposes a method for welding a cut-to-face joint of a thin welding base metal. The thickness of the welding base metal is ≤6.0mm, and the welding method includes the following steps:

Method used

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  • Method for welding cut surface butt joint formed by thin welding base materials
  • Method for welding cut surface butt joint formed by thin welding base materials
  • Method for welding cut surface butt joint formed by thin welding base materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Example 1: For specifications of The stainless steel pipe group is welded to form a cut-butt joint

[0070] The pipe diameter of the pipe to be welded is 88.9 mm, and the pipe wall thickness H is 3.05 mm. The welding power source is German STAPLA ultrasonic and TIG composite arc welding machine, and the welding equipment is cantilever automatic welding equipment.

[0071] (1) Select shielding gas and tungsten electrode:

[0072] ①Select the protective gas: the protective gas is argon with a purity of 99.99%.

[0073] ②Select tungsten electrode:

[0074] The tungsten pole is a cerium tungsten pole with a diameter of 4.0mm and a taper of 40°, and a tungsten pole with a platform diameter of 0.0mm is used for bottom welding, and a tungsten pole with a platform diameter of 0.3mm is used for filling and cap welding. pole.

[0075] (2) Welding joint pair:

[0076] Before the assembly, the pipe is cut off with a band saw, and the section to be welded is smoothed with a g...

Embodiment 2

[0091] Example 2: For specifications of The stainless steel pipe group is welded to form a cut-butt joint

[0092] The pipe diameter of the pipe to be welded is 114.3 mm, and the pipe wall thickness H is 6.0 mm. The welding power source is German STAPLA ultrasonic and TIG composite arc welding machine, and the welding equipment is cantilever automatic welding equipment.

[0093] (1) Select shielding gas and tungsten electrode:

[0094] ①Select the protective gas: the protective gas is argon with a purity of 99.99%.

[0095] ②Select tungsten electrode:

[0096] The tungsten pole is a cerium tungsten pole with a diameter of 4.0mm and a tungsten pole taper of 40°. A tungsten pole with a platform diameter of 0.0mm is used for bottom welding, and a tungsten pole with a platform diameter of 0.5mm is used for filling and cap welding. pole.

[0097] (2) Welding joint pair:

[0098] Before the assembly, the pipe is cut off with a band saw, and the section to be welded is smoothed ...

Embodiment 3

[0108] Example 3: For specifications of The carbon steel pipe group is welded to form a face-to-face butt joint

[0109] The pipe diameter of the pipe to be welded is 168.0 mm, and the pipe wall thickness H is 4.37 mm. The welding power source is German STAPLA ultrasonic and TIG composite arc welding machine, and the welding equipment is cantilever automatic welding equipment.

[0110] (1) Select shielding gas and tungsten electrode:

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Abstract

The invention relates to a method for a welding cut surface joint formed by assembling cut surface ports, in particular to a method for welding a cut surface butt joint formed by thin welding base materials in nuclear power engineering, and aims to solve the problems that the machining period of tubes and welding period are relatively long, the welding cost is high, and part of the materials are not completely welded in the prior art. According to the method, the thickness of each welding base material is less than or equal to 6.0mm. The method comprises the following steps of: selecting protective gas and a tungsten electrode; assembling craters; overlapping an ultrasonic electrical signal on pulse welding current to generate a stable ultrasonic- tungsten inert gas (TIG) combined weld electric arc by taking ultrasonic waves and TIG combined electric arc welding machine as a welding power supply of automatic welding equipment, and performing backing welding on the surface butt joints without feeding wires; performing cosmetic welding, and finishing welding. By the welding method, the processing step of forming a groove is eliminated, so that the welding workload, the consumption of welding filling materials and the welding cost are reduced, and the welding efficiency is improved.

Description

technical field [0001] The invention relates to a method for welding a cut-butt joint formed by a cut-face interface group, in particular to a method for welding a cut-butt joint of a thinner welding base material used in nuclear power engineering. Background technique [0002] TIG (Tungsten Inert Gas Welding) welding is non-melting inert gas shielded arc welding. When using this welding technique for such figure 1 When welding the cut-butt joints of pipe A and pipe B shown without beveling or cut-face joints, only the butt joints with a thickness not exceeding 3.0mm (millimeters) and made of carbon steel, low-alloy steel, stainless steel or aluminum can be welded. For butt joints made of high-nickel alloys, this welding technology has less penetration and can only weld butt joints with a thickness not exceeding 2.5mm. [0003] Due to the weak penetration of the TIG welding arc, when the wall thickness of carbon steel, low alloy steel, stainless steel and aluminum pipes to...

Claims

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Application Information

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IPC IPC(8): B23K28/02B23K9/167
Inventor 董玉川韩乃山胡广杰曹冬巍冯英超魏清海王挺
Owner CHINA NUCLEAR IND 23 CONSTR
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