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Efficient welding method of S460NL high-strength steel flange

A welding method and high-strength steel technology, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of slow welding speed, large spatter, and large welder damage, and achieve the effect of high production efficiency

Inactive Publication Date: 2017-11-07
NANTONG ZHENHUA HEAVY EQUIP MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The deposition efficiency of the above method is not high, the welding speed is slow, the application cost is high, the spatter is large, the probability of defects such as pores, lack of fusion, and incomplete penetration is high, and the slag removal of the electrode is also poor.
At the same time, welding arc, noise, smoke and harmful gas will cause great harm to welders

Method used

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  • Efficient welding method of S460NL high-strength steel flange

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Effect test

Embodiment 1

[0021] A high-efficiency welding method for S460NL high-strength steel flanges. After two steps of welding material selection and welding control process, the efficient welding method for S460NL high-strength steel flanges is completed; the specific steps are as follows:

[0022] (1) Selection of welding materials: use submerged arc welding for welding, use H-14 welding wire as the welding wire, and use fluorine-alkaline sintering flux as the sintering flux. The diameter of the welding wire is 4mm, and the alkalinity of the flux is 3.0.

[0023] (2) Welding control process:

[0024] a. Use semi-automatic flame cutting method to cut the groove of S460NL high-strength steel flange, and clean the oil, rust, oxide and other impurities within 30mm around the groove of the weld seam until the metallic luster is exposed;

[0025] b. When the S460NL high-strength steel flange is assembled, the inner wall is flush, if there is a gap, the value of the gap is 0mm;

[0026] c. The area t...

Embodiment 2

[0030] A high-efficiency welding method for S460NL high-strength steel flanges. After two steps of welding material selection and welding control process, the efficient welding method for S460NL high-strength steel flanges is completed; the specific steps are as follows:

[0031] (1) Selection of welding materials: use submerged arc welding for welding, use H-14 welding wire as the welding wire, and use fluorine-alkaline sintering flux as the sintering flux. The diameter of the welding wire is 4mm, and the alkalinity of the flux is 3.0.

[0032] (2) Welding control process:

[0033] a. Use semi-automatic flame cutting method to cut the groove of S460NL high-strength steel flange, and clean the oil, rust, oxide and other impurities within 50mm around the groove of the weld seam until the metallic luster is exposed;

[0034] b. When the S460NL high-strength steel flange is assembled, the inner wall is flush, if there is a gap, the value of the gap is 1mm;

[0035] c. The area t...

Embodiment 3

[0039] A high-efficiency welding method for S460NL high-strength steel flanges. After two steps of welding material selection and welding control process, the efficient welding method for S460NL high-strength steel flanges is completed; the specific steps are as follows:

[0040] (1) Selection of welding materials: use submerged arc welding for welding, use H-14 welding wire as the welding wire, and use fluorine-alkaline sintering flux as the sintering flux. The diameter of the welding wire is 4mm, and the alkalinity of the flux is 3.0.

[0041] (2) Welding control process:

[0042] a. Use semi-automatic flame cutting method to cut the groove of S460NL high-strength steel flange, and clean up the oil, rust, oxide and other impurities within 40mm around the groove of the weld until the metallic luster is exposed;

[0043] b. When the S460NL high-strength steel flange is assembled, the inner wall is flush, and if there is a gap, the value of the gap is 0.5mm;

[0044] c. The ar...

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Abstract

The invention discloses an efficient welding method of an S460NL high-strength steel flange. Through two process steps including welding material selection and welding control, efficient welding of the S460NL high-strength steel flange is completed. According to the efficient welding method, the manual electrode melting efficiency is 55%, the flux-cored wire melting efficiency reaches 90%, and the submerged-arc welding melting efficiency is 99%. According to the efficient welding method, submerged-arc welding is slag protection, welding flux and welding slag can prevent air from invading into a bath, thermal insulation can be carried out, the welding line cooling speed is decreased, and the connector mechanical property is guaranteed. Welding parameters are preset, the stable welding parameters are guaranteed, electric arcs are stable, slag removal is easy, the welding line surface is bright and clean, welding way molding is attractive, and welding line ingredients are even. The requirement for a welding worker is low, the x-ray detection yield is very high and reaches above 99%.

Description

technical field [0001] The invention relates to a welding method, in particular to a high-efficiency welding method for S460NL high-strength steel flanges. Background technique [0002] S460NL high-strength steel flange (T=165mm) is a very critical and core component of a certain mast crane of our company. [0003] At present, the welding of high-strength quenched and tempered steels such as S460NL in domestic offshore products generally adopts manual electrode arc welding or flux-cored wire CO2 gas shielded welding. It has very high requirements for welding, welding rod baking and recycling, and moisture-proof storage requirements for welding wire. The above method has low deposition efficiency, slow welding speed, high application cost, large spatter, high probability of defects such as pores, lack of fusion, and incomplete penetration, and poor slag removal of the electrode. At the same time, welding arc light, noise, smoke and harmful gas are harmful to welders. Cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K28/02B23P15/00
CPCB23K28/02B23P15/00
Inventor 杜高峰范正林
Owner NANTONG ZHENHUA HEAVY EQUIP MFG
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