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Efficient titanium alloy laser-electric arc composite heat source pipeline welding process

A technology of welding process and composite heat source, which is applied in laser welding equipment, welding equipment, metal processing, etc., can solve the problems of easy formation of undercut defects in welded joints, poor penetration ability of heat source energy, and reduce the safety factor of joints, etc., to achieve shortening The effect of engineering construction period, saving welding filling materials and improving welding production efficiency

Pending Publication Date: 2021-08-06
JIANGSU TONGYU STEEL PIPE GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the energy dispersion of the arc heat source, low energy density, and poor energy penetration of the heat source, the improvement of welding speed is still greatly limited.
In the high-energy beam welding method, due to its very concentrated energy density and the negative surface tension gradient of the liquid titanium alloy in the molten pool, the welded joint is prone to undercut defects, which reduces the safety factor of the joint.

Method used

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  • Efficient titanium alloy laser-electric arc composite heat source pipeline welding process
  • Efficient titanium alloy laser-electric arc composite heat source pipeline welding process
  • Efficient titanium alloy laser-electric arc composite heat source pipeline welding process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Example 1: Longitudinal seam welding of TA2 titanium alloy pipes with a wall thickness of 1 mm and a pipe diameter of φ110 mm

[0060] 1. Preparation before welding

[0061] (1) Check whether the surface of the workpiece is wet. If the surface of the workpiece is wet, wait for it to dry before welding;

[0062] (2) Clean the oil stains on the welding parts;

[0063] (3) The welding method and the selection of welding materials, the laser-TIG arc composite main method is selected for welding, and the purity of Ar gas is 99.99%.

[0064] 2. Spot welding

[0065] (1) According to the size of the welded structural parts, the length of spot welding is selected as 5mm;

[0066] (2) Pay attention to spot welding. The fixed width of spot welding shall not exceed 3mm. It should be a part of the future weld. When there is crack in the spot weld, it must be cut off and rewelded.

[0067] 3. Welding

[0068] For the I-shaped groove, the welding process without filler wire is s...

Embodiment 2

[0072] Example 2: Longitudinal seam welding of TC4 titanium alloy pipe with wall thickness 8mm and pipe diameter φ150mm

[0073] 1. Preparation before welding

[0074] (1) Groove processing, single side 20°, blunt side 2mm;

[0075] (2) Check whether the surface of the workpiece is wet. If the surface of the workpiece is wet, wait for it to dry before welding;

[0076] (3) Clean the oil stains on the welding parts;

[0077] (4) The welding method and the selection of welding materials, the laser-TIG arc composite main method is used for welding, and the purity of Ar gas is 99.99%.

[0078] 2. Spot welding

[0079] (1) According to the size of the welded structural parts, the length of spot welding is selected as 10mm;

[0080] (2) Pay attention to spot welding. The fixed height and width of spot welding shall not exceed 0.8mm and 3mm. It should be part of the future weld.

[0081] 3. Welding

[0082] Bottom welding: The welding process is arc current 240A, average laser ...

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Abstract

The invention provides an efficient titanium alloy laser-electric arc composite heat source pipeline welding process. The efficient titanium alloy laser-electric arc composite heat source pipeline welding process comprises the following steps that a groove is processed according to the plate thickness of a to-be-welded workpiece, greasy dirt at a welding part is cleaned, and the surface of the to-be-welded workpiece is kept dry; spot welding fixing is conducted on the to-be-welded workpiece before formal welding according to the size of the to-be-welded workpiece; a laser-TIG electric arc composite main mode is selected for welding; whether cold filling wire / cosmetic welding exists or not is determined according to the groove form of the to-be-welded workpiece, and if yes, a welding wire with the preset diameter is selected for filling according to the preset wire feeding speed; high-quality welding seam forming of longitudinal and circular seams of a pipeline is achieved through thin plate single-layer welding and thick plate multi-layer and multi-pass welding of the to-be-welded workpiece; and after welding, weld seams which do not meet the standard are polished, and splashes are removed. The welding steps are simplified, the welding mode is simple, material selection is accurate and standard, and the titanium pipe welding quality can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of material engineering welding, in particular to an efficient titanium alloy laser-arc composite heat source pipeline welding process. Background technique [0002] Due to its good corrosion resistance, titanium alloy pipelines have been widely used in marine engineering, oil and gas transportation, chemical industry and other fields. [0003] As the key technology of pipeline manufacturing, welding technology plays a decisive role in the quality of the final pipeline. Titanium alloy has the characteristics of small thermal conductivity. The cooling rate of the molten pool is slow during welding. The molten pool is continuously affected by the arc heat source, and the welding molten pool will gradually increase. The more liquid metal in the molten pool leads to a large melting point. When the self-weight of the molten pool gradually increases beyond the threshold of the supporting force of the bottom molte...

Claims

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Application Information

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IPC IPC(8): B23K26/348
CPCB23K26/348B23K2101/06B23K2103/14
Inventor 方晓东刘黎明张兆栋鲁宁许志东
Owner JIANGSU TONGYU STEEL PIPE GRP
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