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Laser and arc composite welding method of martensite precipitation-hardening stainless steel

A precipitation hardening, laser arc technology, used in laser welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of insufficient precision and uneven bottom weld formation, and achieve the effect of uniform forming, small deformation, and avoiding peroxidation.

Inactive Publication Date: 2019-10-01
WUHAN JINDUN LASER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the laser arc hybrid welding method is only used in the prior art for the welding of the above-mentioned special steel, there are defects such as uneven bottom weld formation and insufficient precision.

Method used

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  • Laser and arc composite welding method of martensite precipitation-hardening stainless steel
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  • Laser and arc composite welding method of martensite precipitation-hardening stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The laser arc hybrid welding method of the martensitic precipitation hardening stainless steel of the present embodiment is realized according to the following steps:

[0042] S1: Process the butt joints of the two workpieces to be welded into a Y shape, the groove angle θ is 65 degrees, and the blunt edge thickness d1 is 3mm;

[0043] S2: Grind the processed groove and side walls on both sides, and use a cleaning agent (acetone, alcohol or isopropanol solution of analytically pure grade) to clean up oil, metal powder, etc. that affect the welding quality, and dry it with compressed air ;

[0044] S3: Assemble and fix the two workpieces to be welded so that the gap d2 between them is 0.2mm;

[0045] S4: Pass the protective gas into the groove position 5000ms before the laser rooting welding, so as to isolate the groove position from the outside air during the rooting welding. The pressure of the protective gas is 0.25Mpa, and the protective gas The air flow rate is 9L...

Embodiment 2

[0052] The laser arc hybrid welding method of the martensitic precipitation hardening stainless steel of the present embodiment is realized according to the following steps:

[0053] S1: Process the butt joints of the two workpieces to be welded into a Y shape, the groove angle θ is 70 degrees, and the blunt edge thickness d1 is 3.5mm;

[0054] S2: Grind the processed groove and side walls on both sides, and use a cleaning agent (acetone, alcohol or isopropanol solution of analytically pure grade) to clean up oil, metal powder, etc. that affect the welding quality, and dry it with compressed air ;

[0055] S3: Assemble and fix the two workpieces to be welded so that the gap d2 between them is 0.3 mm;

[0056] S4: Pass the protective gas (nitrogen or argon) into the groove position 6000ms before the laser rooting welding, so as to separate the groove position from the outside air during rooting welding and filler wire cap welding Insulation, the pressure of the protective gas...

Embodiment 3

[0063] The laser arc hybrid welding method of the martensitic precipitation hardening stainless steel of the present embodiment is realized according to the following steps:

[0064] S1: Process the butt joints of the two workpieces to be welded into a Y shape, the groove angle θ is 60 degrees, and the blunt edge thickness d1 is 3mm;

[0065] S2: Grind the processed groove and side walls on both sides, and use a cleaning agent (acetone, alcohol or isopropanol solution of analytically pure grade) to clean up oil, metal powder, etc. that affect the welding quality, and dry it with compressed air ;

[0066] S3: Assemble and fix the two workpieces to be welded so that the gap d2 between them is 0.25mm;

[0067] S4: 5000ms before the laser root welding, the protective gas is introduced into the groove position, so as to isolate the groove position from the outside air during the root welding and the filler wire cover welding, and the air pressure of the protective gas 0.2Mpa, the...

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Abstract

The invention relates to a laser and arc composite welding method of martensite precipitation-hardening stainless steel. The method includes the steps that butt joint connection ports of two to-be-welded workpieces are machined into grooves; the two to-be-welded workpieces are assembled and fixed, and a gap is reserved between the two to-be-welded workpieces; laser is adopted for performing backing welding on the bottoms of the grooves, and bottom weld joints are performed; and laser and arc composite welding is adopted for performing wire filling and face covering welding on the grooves, anda welding process is completed. According to the method, due to the fact that the laser backing welding is firstly performed on the bottoms of the grooves formed after machining of the to-be-welded workpieces, penetration fusion welding is achieved, through welding of the bottom of a truncated edge can be guaranteed, so that the weld joints at the bottoms of the grooves are uniform in forming, deformation is small, and the welding precision is guaranteed; then laser-arc composite welding is adopted for performing wire filling and face covering welding on the grooves, and therefore the high-quality weld joints are formed; and work procedures are simple, operation is easy, the process cost is low, and a good welding effect is achieved on the special material of the martensite precipitation-hardening stainless steel.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a laser arc hybrid welding method for martensitic precipitation hardening stainless steel. Background technique [0002] Ultra-high-strength martensitic precipitation-hardening stainless steel is a new type of steel developed on the basis of Cr13 martensitic stainless steel. It is widely used for its high strength, good toughness, good corrosion resistance, and excellent comprehensive performance. It is used in aerospace, aircraft manufacturing, weaponry, nuclear power plant, petrochemical and other fields. Due to the complex structure and harsh working conditions of these parts, and all of them are welded, this puts forward high requirements on the quality of welded joints and the performance of materials. [0003] As we all know, the laser welding process has a high power density, a very narrow heat-affected zone, precise energy control, and high-precision high-speed welding....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/348B23K26/70
CPCB23K26/348B23K26/702
Inventor 金翔杨权陈吉成健
Owner WUHAN JINDUN LASER TECH CO LTD
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