Welding repair method of 4145h forging and its repaired 4145h forging

A welding repair and forging technology, which is applied in the field of steel welding, can solve the problems of high hydrogen content and high hardness of forgings, and achieve the effects of improving weld toughness, reducing hardening degree, and reducing production costs

Active Publication Date: 2019-02-15
HENAN ZHONGYUAN HEAVY FORGING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The first object of the present invention is to provide a welding repair method for 4145H forgings. In the method, the 4145H forgings are welded by using body welding wire, surfacing welding, annealing and other steps. The welded forgings are not easy to produce pores and cold cracks. At the same time, it overcomes the defect that the hydrogen content in the weld seam is too high after the repair welding of the forging, which leads to the high hardness of the repaired forging

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  • Welding repair method of 4145h forging and its repaired 4145h forging

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Embodiment 1

[0080] A welding repair method for 4145H forgings, mainly comprising the following steps:

[0081] (1) Preparation before welding: Grind and clean the cracked or damaged part of the forging and process a U-shaped groove. The included angle of the groove is 10°, the bottom of the groove is arc-shaped, and the minimum gap of the groove is 8mm; At a temperature of 380°C, preheat as a whole for 3 hours, the preheating rate is 80°C / h, and dry the J507 electrode with a diameter of 3mm at 350°C for 2 hours;

[0082] (2) Welding: Surfacing the forging with the welding wire of the body and the electrode dried in step (1). Then use a flat-bottomed hammer to hammer the surface of the weld bead vertically, and the hammering direction between two adjacent welding layers should be opposite, and then the welding is completed layer by layer;

[0083](3) Annealing: After the welding is completed, the forging is subjected to stress-relief annealing, and the forging is placed in a tempering fur...

Embodiment 2

[0086] A welding repair method for 4145H forgings, mainly comprising the following steps:

[0087] (1) Preparation before welding: Grind and clean the cracked or damaged part of the forging and process a U-shaped groove. The included angle of the groove is 20°, the bottom of the groove is arc-shaped, and the minimum gap of the groove is 12mm; At a temperature of 420°C, the overall preheating is for 5 hours, the preheating rate is 80°C / h, and the J507 electrode with a diameter of 3.5mm is dried at 400°C for 3 hours;

[0088] (2) Welding: Surfacing the forging with the welding wire of the body and the electrode dried in step (1). Then use a flat-bottomed hammer to hammer the surface of the weld bead vertically, and the hammering direction between two adjacent welding layers should be opposite, and then the welding is completed layer by layer;

[0089] (3) Annealing: After the welding is completed, the forging is subjected to stress-relief annealing, and the forging is placed in...

Embodiment 3

[0092] A welding repair method for 4145H forgings, mainly comprising the following steps:

[0093] (1) Preparation before welding: Grind and clean the cracked or damaged part of the forging and process a U-shaped groove. The included angle of the groove is 15°, the bottom of the groove is arc-shaped, and the minimum gap of the groove is 10mm; At a temperature of 400°C, the overall preheating is for 4 hours, the preheating temperature rise rate is 80°C / h, and the J507 electrode with a diameter of 3.2mm is dried at 380°C for 2 hours;

[0094] (2) Welding: Surfacing the forging with the welding wire of the body and the electrode dried in step (1). Then use a flat-bottomed hammer to hammer the surface of the weld bead vertically, and the hammering direction between two adjacent welding layers should be opposite, and then the welding is completed layer by layer;

[0095] (3) Annealing: After the welding is completed, the forging is subjected to stress-relief annealing, and the for...

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Abstract

The invention provides a 4145H forged piece, which relates to technical field of welding of rolled steels. The method of repair welding of 4145H forged piece mainly includes steps of preparing before welding, welding and annealing. The method of repair welding of 4145H forged piece uses welding wires of the forged piece itself to make surfacing, resolving problems of generating blowholes, cold cracks, slag inclusions and the problem of higher hardness in prior arts of using conventional repair welding method. Additionally, the method of repair welding realizes the technical effect of no cracking, and the effect of that the materials of weld bead structure conforms to the forged piece itself.

Description

technical field [0001] The invention relates to the technical field of steel welding, in particular to a welding repair method for a 4145H forging and the repaired 4145H forging. Background technique [0002] 4145H, also known as oil drill collar steel. As an alloy structural steel, 4145H is widely used in the field of industrial equipment due to its special properties, especially in petroleum equipment products. [0003] Nowadays, the energy industry invests more and more in oil and gas extraction, especially the importance and strategic position of exploration and development in deep sea areas and cold sea areas has attracted more and more people's attention. Therefore, more stringent performance requirements are put forward for the steel structure and equipment used in petroleum equipment, and these engineering steels show a trend of large-scale structure and ultra-high strength, which puts forward higher requirements and requirements for the steel structure of petroleum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P6/00B23K9/04
CPCB23K9/04B23P6/00
Inventor 陈子平陈卫东王济生刘海斌
Owner HENAN ZHONGYUAN HEAVY FORGING
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