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A non-preheating submerged arc welding method for eh36 high-strength steel thick plates

A high-strength steel, EH36 technology, applied in arc welding equipment, welding equipment, welding accessories, etc., can solve the problems of high restraint, high production cost, long production cycle, etc., to avoid pre-welding preheating process, shorten production Cycle time, the effect of reducing production costs

Active Publication Date: 2021-06-11
广州黄船海洋工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the welding process of EH36 thick plate, due to the large degree of restraint, and the rapid heat dissipation and high cooling rate of the thick plate, it is easy to form cold cracks in the welded joints, and usually requires pre-welding preheating process measures
However, the preheating before welding needs to provide more equipment, energy, labor and other inputs to complete, the production cost is high and the production cycle is long

Method used

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  • A non-preheating submerged arc welding method for eh36 high-strength steel thick plates
  • A non-preheating submerged arc welding method for eh36 high-strength steel thick plates
  • A non-preheating submerged arc welding method for eh36 high-strength steel thick plates

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Embodiment 1

[0034] This embodiment discloses a non-preheating submerged arc welding method in which the welding plate is a thick plate of EH36 high-strength steel, wherein the thickness of the thick plate of EH36 high-strength steel is less than or equal to 64mm, specifically including the following steps:

[0035] Step 1, process X-type welding grooves at the welding place of EH36 high-strength steel thick plates, and the corresponding parameters of X-type welding grooves are: the angle of the front groove is 55°~65°, and the depth of the front groove is 2 / 3 thick, the angle of the groove on the back is 60°~70°, the blunt edge is 4~6mm, and the root gap is 0-1mm; after processing, the oxide layer on the X-type welding groove surface and the X-type welding Clean up the impurities within 20-30mm around the groove (including the oxide layer, rust, moisture or other impurities at the groove) to prevent the impurities near the X-shaped welding groove from being welded into the weld during the ...

Embodiment 2

[0058] This embodiment discloses a non-preheating submerged arc welding method in which the welding plate is a thick plate of EH36 high-strength steel, wherein the thickness of the thick plate of EH36 high-strength steel is not less than 64mm, specifically including the following steps:

[0059] Step 1, process X-type welding grooves at the welding place of EH36 high-strength steel thick plates, and the corresponding parameters of X-type welding grooves are: the angle of the front groove is 55°~65°, and the depth of the front groove is 2 / 3 thick, the angle of the groove on the back is 60°~70°, the blunt edge is 4~6mm, and the root gap is 0-1mm; after processing, the oxide layer on the X-type welding groove surface and the X-type welding Clean up the impurities within 20-30mm around the groove (including the oxide layer, rust, moisture or other impurities at the groove) to prevent the impurities near the X-shaped welding groove from being welded into the weld during the welding ...

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Abstract

The present invention proposes a non-preheating submerged arc welding method for EH36 high-strength steel plate, comprising the following steps: processing an X-shaped welding groove at the welding place of EH36 high-strength steel plate; 2 The gas shielded welding completes the positioning welding at the X-shaped welding groove; through the semi-automatic CO 2 The gas shielded welding method welds the arc starting plate and the arc extinguishing plate at both ends of the X-shaped welding groove; the welding flux and the welding wire with a diameter of 5mm are used to weld the welding plate at the tack welding seam, and the temperature between the welding processes is maintained When the temperature is below 230°C, slag removal shall be carried out after the welding of each weld seam; after the filling of the front groove welding is completed, the root of the groove shall be cleaned by carbon arc gouging and mechanical grinding, and then the back weld shall be cleaned. filling. The invention can effectively avoid the generation of welding cracks to ensure the quality of the weld seam, and at the same time reduce the input of preheating equipment, energy, labor, etc. before welding, reduce production costs, and shorten the production cycle.

Description

technical field [0001] The invention relates to a submerged arc welding process, in particular to a non-preheating submerged arc welding method for EH36 high-strength steel thick plates. Background technique [0002] During the operation of the platform installed by wind power, the pile room, pile legs, and pile shoes are the main supporting structures of the platform. The structural performance directly determines the working capacity of the wind power installation platform. [0003] EH36 is a high-strength hull structural steel with a yield strength level greater than or equal to 355MPa. It has good low-temperature impact toughness. Shock resistance. However, during the welding process of the EH36 thick plate, due to the large degree of restraint, the rapid heat dissipation of the thick plate, and the high cooling rate, it is easy to form cold cracks in the welded joints, and pre-weld preheating measures are usually required. However, the preheating before welding needs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/18B23K9/16B23K9/02B23K9/32B23K103/04
CPCB23K9/02B23K9/16B23K9/18B23K9/32
Inventor 张继军邵丹丹陈立群杨婷卓振坚曾繁强何春华
Owner 广州黄船海洋工程有限公司