Non-preheating gas protection welding method for EH36 high-strength steel thick plate

A gas shielded welding and high-strength steel technology, applied in welding equipment, welding medium, welding equipment and other directions, can solve the problems of high restraint, high production cost, high cooling speed, etc., to avoid pre-welding preheating process, shorten the Production cycle, the effect of ensuring the quality of the weld

Inactive Publication Date: 2019-07-12
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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  • Non-preheating gas protection welding method for EH36 high-strength steel thick plate
  • Non-preheating gas protection welding method for EH36 high-strength steel thick plate
  • Non-preheating gas protection welding method for EH36 high-strength steel thick plate

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Embodiment 1

[0040] This embodiment discloses a non-preheating gas shielded 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:

[0041] Step 1: Process a V-shaped welding groove at the welding place of the EH36 high-strength steel plate. The corresponding parameters of the V-shaped welding groove are: the groove angle is 35°~45°, the blunt edge is 0~1mm, the root gap 6-10mm; After processing, the oxide layer on the V-shaped welding groove surface and the impurities within 20-30mm around the V-shaped welding groove (including the oxide layer, rust, moisture or other impurities at the groove) Clean up to prevent the impurities near the V-shaped welding groove from being welded into the weld during the welding process, which will easily cause welding defects such as cracks, pores, and slag inclusions;

[0042] The ...

Embodiment 2

[0070] This embodiment discloses a non-preheating gas shielded welding method for thick plates whose welding plate is EH36 high-strength steel with a thickness less than or equal to 64mm, specifically including the following steps:

[0071] Step 1: Process a V-shaped welding groove at the welding place of the EH36 high-strength steel plate. The corresponding parameters of the V-shaped welding groove are: the groove angle is 35°-45°, the blunt edge is 1mm, and the root gap is 6 ~10mm; After processing, clean the oxide layer on the V-shaped welding groove surface and the impurities within 20-30mm around the V-shaped welding groove (including the oxide layer, rust, moisture or other impurities at the groove) , in order to prevent the impurities of the V-shaped welding groove attachment from being welded into the weld during the welding process, which is prone to cracks;

[0072] Among them, when processing the V-shaped welding groove, it can be processed by flame cutting, plasma ...

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Abstract

The invention provides a non-preheating gas protection welding method for an EH36 high-strength steel thick plate. The non-preheating gas protection welding method comprises the following steps that aV-shaped welding slope is machined at the welding place of the EH36 high-strength steel thick plate, assembling is conducted on a welding plate by a clamping stacking, the clamping stacking is assembled on the back face side of the V-shaped welding slope, and a ceramic liner is arranged on the back face side of the V-shaped welding slope; and a run-on plate and a run-off plate are respectively welded to the two ends of the V-shaped welding slope through a semi-automatic CO2 gas protection welding manner, a flux cored wire with the diameter of 1.2mm is selected to conduct welding on the welding plate, the inter-channel temperature maintains below 230 DEG C in the welding process, and after each welding seam welding is finished, the slag cleaning work is conducted. By means of the non-preheating gas protection welding method, the generation of the welding cracks can be effectively avoided so that the welding quality is ensured, meanwhile, the input of pre-welding preheating equipment, energy, labor and the like is reduced, the production costs are reduced, and the production cycle is shortened.

Description

technical field [0001] The invention relates to a non-preheating gas shielded welding process, in particular to a non-preheated gas shielded 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 w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/02B23K9/16B23K9/32B23K103/04
CPCB23K9/02B23K9/16B23K9/32B23K35/0266
Inventor 邵丹丹张继军杨婷陈立群雷炳育卓振坚何春华
Owner 广州黄船海洋工程有限公司
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