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A low heat input narrow gap vertical gas-electric vertical welding method

A technology of vertical gas-electric vertical welding and narrow gap, which is applied in the direction of arc welding equipment, welding equipment, welding medium, etc., can solve the problems of large heat input and poor penetration of side walls, etc., and achieve the reduction of weld filling area and ensure Penetration effect, effect of reducing production cost

Active Publication Date: 2020-06-19
张家口泥河湾产业发展有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the deficiencies of the prior art, the object of the present invention is to propose a vertical gas-electric vertical welding method with low heat input and narrow gap, which realizes single-layer single-pass welding of thick plates with low heat input, and overcomes the need for single-layer multi-pass welding in narrow gap welding Compared with traditional vertical gas-electric welding, the disadvantages of large heat input and poor penetration of the side wall of the swinging wire gas-electric welding method

Method used

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  • A low heat input narrow gap vertical gas-electric vertical welding method
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  • A low heat input narrow gap vertical gas-electric vertical welding method

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Effect test

Embodiment 1

[0022] Prepare the welding test plate EH36, label A, the plate thickness is 65mm, the length is 1000mm, no groove is required, and the root gap is 11mm. According to the formula Q=0.8h+20*(d-10) fitted according to the new process, it can be calculated The output heat input is about 72kJ / cm, and the appropriate welding current, voltage and welding speed are deduced from the calculated heat input, as shown in Table 1.

[0023] Table 1 Embodiment 1 Welding process parameters

[0024]

Embodiment 2

[0033] Prepare the welding test plate EQ47, label C, the plate thickness is 140mm, the length is 1200mm, there is no need to open the groove, and the root gap is 12mm. According to the formula Q=0.8h+20*(d-10) fitted according to the new process, it can be calculated The output heat input is about 152kJ / cm, and the appropriate welding current, voltage and welding speed are deduced from the calculated heat input, as shown in Table 4.

[0034] Table 4 embodiment 2 welding process parameters

[0035]

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Abstract

The invention discloses a low-heat-input narrow-clearance vertical electro-gas welding method. According to the low-heat-input narrow-clearance vertical electro-gas welding method, a groove type is anI-shaped groove; the clearance of the groove is 10 mm to 14 mm; a traditional cylindrical welding gun is designed as an elliptic column structure so as to adapt to the welding of the narrow-clearancegroove; for guaranteeing that an electric arc and a sidewall form a certain included angle, two asymmetric gears are used for bending a welding wire so that the welding wire can swing back and forthinside the groove; and by lots of welding tests, a relational expression of the groove clearance d (mm), a plate thickness h (mm) and welding heat input Q (KJ / cm) is obtained, namely Q=0.8h+20x(d-10).By combining narrow-clearance welding with a vertical electro-gas welding method, the low-heat-input narrow-clearance vertical electro-gas welding method disclosed by the invention realizes low-heat-input single-layer single-pass welding of a thick plate and overcomes the shortcomings that a narrow-clearance welding method needs single-layer multi-pass welding and a traditional vertical electro-gas welding method is large in heat input and poor in sidewall fusion penetration property.

Description

technical field [0001] The invention belongs to welding technology, in particular to a vertical gas-electric vertical welding method with low heat input and narrow gap. Background technique [0002] The vertical gas-electric vertical welding method is a highly efficient welding method that is very suitable for the welding of medium and thick plates. The weld is formed at one time. The biggest problem with the vertical gas-electric vertical welding method is the high welding heat input. Generally, the plate thickness of 30mm, the heat input It is necessary to reach more than 150KJ / cm, and the heat input of 80mm plate thickness should reach nearly 500KJ / cm. The increase of heat input caused by the increase of plate thickness during welding will reduce the crystallization speed of the weld metal, which will bring about grain size. Coarse, resulting in the reduction of the mechanical properties of the weld, which seriously affects the low temperature impact toughness of the weld...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K33/00B23K35/02B23K9/025B23K9/173
CPCB23K9/025B23K9/173B23K33/004B23K35/0261
Inventor 沈若松
Owner 张家口泥河湾产业发展有限公司
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