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Submerged-arc welding overlaying technology

A technology of submerged arc welding and submerged arc automatic welding machine, which is applied in arc welding equipment, manufacturing tools, welding equipment, etc. quality, the effect of improving the ability to resist intergranular corrosion

Inactive Publication Date: 2018-05-04
江苏能建机电实业集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] CN101549424 discloses a submerged arc welding surfacing process, which can solve the problem of adhesion between steel coils and support rolls, save production costs, and improve product production quality, but there is a need to improve the intergranular corrosion resistance of the surfacing welds. question

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  • Submerged-arc welding overlaying technology

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A submerged arc welding surfacing process, comprising the steps of:

[0029] (1) Overlay inspection

[0030] First check the integrity of the surfacing weldment;

[0031] (2) Pretreatment

[0032] Grind the surface of the welded overlay after inspection with an angle grinder, and then use acetone to remove scale and oil;

[0033] (3) Washing and drying with water

[0034] The surface of the pre-treated surfacing weldment is washed with water, and then the drying process is carried out. The drying temperature is 50 ° C, and the drying time is 20 minutes. The surface washing is divided into three-stage washing, and the three-stage The water washing includes first-level water washing, second-level circulating pure water washing and third-level fresh pure water washing;

[0035] (4) Preheating

[0036] Preheat the dried surfacing in the preheating chamber for 1 hour, and the temperature of the preheated surfacing is 200°C;

[0037] (5) Hardfacing

[0038] Carry out o...

Embodiment 2

[0046] A submerged arc welding surfacing process, comprising the steps of:

[0047] (1) Overlay inspection

[0048] First check the integrity of the surfacing weldment;

[0049] (2) Pretreatment

[0050] Grind the surface of the welded overlay after inspection with an angle grinder, and then use acetone to remove scale and oil;

[0051] (3) Washing and drying with water

[0052] The surface of the pre-treated surfacing weldment is washed with water, and then the drying process is carried out. The drying temperature is 60°C, and the drying time is 25 minutes. The surface washing is divided into three-stage washing, and the three-stage The water washing includes first-level water washing, second-level circulating pure water washing and third-level fresh pure water washing;

[0053] (4) Preheating

[0054] Preheat the dried surfacing in the preheating chamber for 1.5 hours, and the temperature of the preheated surfacing is 250°C;

[0055] (5) Hardfacing

[0056] Carry out ...

Embodiment 3

[0064] A submerged arc welding surfacing process, comprising the steps of:

[0065] (1) Overlay inspection

[0066] First check the integrity of the surfacing weldment;

[0067] (2) Pretreatment

[0068] Grind the surface of the welded overlay after inspection with an angle grinder, and then use acetone to remove scale and oil;

[0069] (3) Washing and drying with water

[0070] The surface of the pre-treated surfacing weldment is washed with water, and then the drying process is carried out. The drying temperature is 70 ° C, and the drying time is 30 minutes. The surface washing is divided into three stages of water washing, and the three stages The water washing includes first-level water washing, second-level circulating pure water washing and third-level fresh pure water washing;

[0071] (4) Preheating

[0072] Preheat the dried surfacing in the preheating chamber for 2 hours, and the temperature of the preheated surfacing is 300°C;

[0073] (5) Hardfacing

[0074]...

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Abstract

The invention discloses a submerged-arc welding overlaying technology. Surface washing is divided into three stages of washing. Dirt, dust, grease and the like on the surface of an overlaying piece can be further removed, and cleanliness of the butt welding surface of a product is ensured; through controlling over the proportion of an alloy layer and the dry extension quantity of welding wires ina submerged-arc automatic welding machine, the possibility of intergranular carbide precipitation is reduced, and the capacity to resist intergranular corrosion of weld joints of the overlaying pieceis improved; and testing is conducted after cooling, the submerged-arc welding overlaying quality can be guaranteed, the submerged-arc welding overlaying technology has the advantage that the intergranular corrosion resistance of the weld joints of the overlaying piece is good, and the market prospects are wide.

Description

technical field [0001] The invention relates to the production field of tank bodies, in particular to a submerged arc welding surfacing process. Background technique [0002] Many thick-walled pressure vessels such as petrochemical vessels and nuclear energy equipment operate in high-temperature and high-pressure environments, and are also subject to corrosion by the medium. Generally, considering the cost and other aspects, the design requires stainless steel cladding on the inner wall of the vessel. According to the working temperature, corrosion characteristics and crack resistance factors of the corrosive medium, the common stainless steel clad layers are 309L / 308L, 309L / 316L and 309L / 347, among which the first layer of surfacing welding 309L is mainly to form The high-toughness transition layer prevents surface cracks from extending to the base metal. At the same time, in order to compensate for the reduction of alloying elements (Cr, Ni) caused by the dilution of the b...

Claims

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Application Information

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IPC IPC(8): B23K9/18B23K9/04B23K9/235B23K9/32
CPCB23K9/04B23K9/18B23K9/235B23K9/32
Inventor 王军郭余庆施吉祥徐志高陈云王君娣赵燕明
Owner 江苏能建机电实业集团有限公司
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