Non-preheating submerged-arc welding method of EH36 high-strength steel thick plate

A high-strength steel, EH36 technology, applied in arc welding equipment, welding equipment, welding accessories, etc., can solve the problems of large restraint, long production cycle, high production cost, etc., to avoid pre-welding preheating process, reduce production Costs and the effect of shortening the production cycle

Active Publication Date: 2019-07-05
广州黄船海洋工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Non-preheating submerged-arc welding method of EH36 high-strength steel thick plate
  • Non-preheating submerged-arc welding method of EH36 high-strength steel thick plate
  • Non-preheating submerged-arc welding method of EH36 high-strength steel thick plate

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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 The impurities within 20-30mm around the groove (including the oxide layer, rust, moisture or other impurities at the groove) should be cleaned to prevent the impurities near the X-shaped welding groove from being welded into the weld du...

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 The impurities within 20-30mm around the groove (including the oxide layer, rust, moisture or other impurities at the groove) should be cleaned to prevent the impurities near the X-shaped welding groove from being welded into the weld during the...

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Abstract

The invention provides a non-preheating submerged-arc welding method of an EH36 high strength steel thick plate. The non-preheating submerged-arc welding method includes the following steps of processing an X-shaped welding groove in the welding point of the EH36 high strength steel thick plate; completing positioned welding at the X-shaped welding groove through semi-automatic CO2 gas shielded welding; welding a starting weld tab and a run-off tab at both ends of the X-shaped welding groove through the method of semi-automatic CO2 gas shielded welding correspondingly; and selecting solderingflux and a welding wire with the diameter being 5mm to weld a welding plate at the positioned weld joint. The interpass temperature is kept at 230 DEG C or below in the welding process and slag removal work is carried out after each weld joint is welded; and the groove root is cleaned after welding filling of a front groove is completed through carbon arc air gouging matched with mechanical grinding,and then the back weld joint is filled filling. According to the non-preheating submerged-arc welding method of the EH36 high strength steel thick plate, generation of a welding crackcan beeffectively avoided to ensurethe quality of the weld joints. At the same time, input of preheating equipment, energy, labor and the like before weldingis reduced, the production cost is reduced, and a production cycle is shortened.

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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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
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