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Efficient welding method for E690 high strength steel cylinder

A welding method and high-strength technology, used in welding equipment, welding/welding/cutting items, arc welding equipment, etc., can solve the problems of low deposition efficiency, poor slag removal of welding rod, high application cost, and achieve X-ray flaw detection. The effect of high pass rate, low welder requirements and high production efficiency

Inactive Publication Date: 2017-10-10
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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A high-efficiency welding method for an E690 high-strength steel cylinder. After two steps of welding material selection and welding process, the efficient welding of the E690 high-strength steel cylinder is completed; the specific steps are as follows:

[0023] (1) Selection of welding materials: The selected welding wires are FLUXOCORD42 and OP121TTW, the flux is fluorine-alkaline sintered flux, the diameter of the welding wire is 4mm, and the alkalinity of the flux is 3.1;

[0024] (2) Welding process:

[0025] a. Use semi-automatic flame cutting method to cut the groove of E690 high-strength steel cylinder, and clean the oil, rust, oxide and other impurities within 30mm around the groove of the front weld until the metallic luster is exposed;

[0026] b. When assembling the E690 high-strength steel cylinder, make the inner wall flush. If there is a gap, the value of the gap is 3mm;

[0027] c. The area to be welded is preheated by electric preheating, the preheatin...

Embodiment 2

[0031] A high-efficiency welding method for an E690 high-strength steel cylinder. After two steps of welding material selection and welding process, the efficient welding of the E690 high-strength steel cylinder is completed; the specific steps are as follows:

[0032] (1) Selection of welding materials: The selected welding wires are FLUXOCORD42 and OP121TTW, the flux is fluorine-alkaline sintered flux, the diameter of the welding wire is 4mm, and the alkalinity of the flux is 3.1;

[0033] (2) Welding process:

[0034] a. Use semi-automatic flame cutting method to cut the groove of E690 high-strength steel cylinder, and clean the oil, rust, oxide and other impurities within 50mm around the groove of the front weld until the metallic luster is exposed;

[0035] b. When assembling the E690 high-strength steel cylinder, make the inner wall flush. If there is a gap, the value of the gap is 3mm;

[0036] c. The area to be welded is preheated by electric preheating, the preheatin...

Embodiment 3

[0040] A high-efficiency welding method for an E690 high-strength steel cylinder. After two steps of welding material selection and welding process, the efficient welding of the E690 high-strength steel cylinder is completed; the specific steps are as follows:

[0041] (1) Selection of welding materials: The selected welding wires are FLUXOCORD42 and OP121TTW, the flux is fluorine-alkaline sintered flux, the diameter of the welding wire is 4mm, and the alkalinity of the flux is 3.1;

[0042] (2) Welding process:

[0043] a. Use semi-automatic flame cutting method to cut the groove of E690 high-strength steel cylinder, and clean the oil, rust, oxide and other impurities within 40mm around the groove of the front weld until the metallic luster is exposed;

[0044] b. When assembling the E690 high-strength steel cylinder, make the inner wall flush. If there is a gap, the value of the gap is 3mm;

[0045] c. The area to be welded is preheated by electric preheating, the preheatin...

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Abstract

The invention discloses an efficient welding method for an E690 high strength steel cylinder. The efficient welding method includes the following steps that through two steps of selecting of welding materials and a welding technology, and efficient welding of the E690 high strength steel cylinder is completed; because submerged-arc welding acts as slag protection, welding flux and welding slag can prevent air from intruding a molten pool, thermal insulation can further be achieved, cooling speed of a welding joint is reduced, and the mechanical properties of junctions are ensured; welding parameters are preset, the stability of the welding parameters is ensured, electric arcs are stable, deslagging is easy, the surface of the welding joint is bright and clean, forming of a welding bead is beautiful, and compositions of the welding joint are further uniform; and according to the efficient welding method for the E690 high strength steel cylinder, requirements for welders are low, and the qualified rate of X ray inspection reaches above 99%.

Description

technical field [0001] The invention relates to a welding method, in particular to a high-efficiency welding method for an E690 high-strength steel cylinder. Background technique [0002] The E690 high-strength steel cylinder is the main leg structure of the jack-up wind power installation vessel, and it is a very critical and core component. [0003] At present, the welding of high-strength quenched and tempered steels such as E690 in domestic marine products generally uses manual electrode arc welding or flux cored wire CO 2 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 g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/18B23K9/235B23K103/04B23K101/04
CPCB23K9/0026B23K9/18B23K9/235B23K2101/04B23K2103/04
Inventor 杜高峰
Owner NANTONG ZHENHUA HEAVY EQUIP MFG
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