Iron-based overlaying flux-cored welding wire for abrasion-resistant belts of drill pipe joints

A technique for drill pipe joints and flux-cored wires, which is applied to welding media, welding equipment, welding equipment, etc., can solve problems such as insufficient crack resistance, and achieve the effects of less pollution, less spatter, and better surfacing process

Inactive Publication Date: 2012-07-18
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of insufficient crack resistance of the current surfacing welding materials, and at the same time reduce the

Method used

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  • Iron-based overlaying flux-cored welding wire for abrasion-resistant belts of drill pipe joints
  • Iron-based overlaying flux-cored welding wire for abrasion-resistant belts of drill pipe joints
  • Iron-based overlaying flux-cored welding wire for abrasion-resistant belts of drill pipe joints

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Take 1.5 kg of ferroboron, 0.06 kg of titanium powder, 0.85 kg of ferroniobium, 0.45 kg of nickel powder, 0.4 kg of electrolytic manganese powder, 0.4 kg of ferrosilicon, 0.25 kg of graphite, and 6.09 kg of reduced iron powder. Put the obtained flux core powder into the U-shaped steel belt groove, the filling rate is 20%, close the U-shaped groove to obtain the drill pipe wear-resistant band surfacing flux-cored wire with a diameter of 1.6mm, and prepare the surfacing according to the above process. The welding layer, the alloy composition in the obtained deposited metal is: C: 0.3wt.%; B: 0.5wt.%; Ti: 0.1wt.%; Nb: 1.0wt.%; Ni: 0.8wt.%; Mn: 0.6wt.%; Si: 0.3wt.%; Fe: balance.

Embodiment 2

[0036] Take 1.7 kg of ferroboron, 0.08 kg of titanium powder, 1.0 kg of ferroniobium, 0.5 kg of nickel powder, 0.45 kg of electrolytic manganese powder, 0.6 kg of ferrosilicon, 0.35 kg of graphite, and 5.32 kg of reduced iron powder. Put the obtained flux core powder into the U-shaped steel belt groove, the filling rate is 23%, close the U-shaped groove to obtain the drill pipe wear-resistant band surfacing flux-cored wire with a diameter of 1.6mm, and prepare the surfacing according to the above process. The welding layer, the alloy composition in the obtained deposited metal is: C: 0.5wt.%; B: 0.7wt.%; Ti: 0.2wt.%; Nb: 1.5wt.%; Ni: 0.85wt.%; Mn: 0.7wt.%; Si: 0.5wt.%; Fe: balance.

Embodiment 3

[0038]Take 1.75 kg of ferroboron, 0.085 kg of titanium powder, 1.2 kg of ferroniobium, 0.55 kg of nickel powder, 0.48 kg of electrolytic manganese powder, 0.7 kg of ferrosilicon, 0.4 kg of graphite, and 4.835 kg of reduced iron powder. Put the obtained flux core powder into the U-shaped steel belt groove, and the filling rate is 25%. Close the U-shaped groove to obtain a drill pipe wear-resistant band surfacing flux-cored wire with a diameter of 1.6mm, and prepare the surfacing according to the above process. The welding layer, the alloy composition in the obtained deposited metal is: C: 0.54wt.%; B: 0.75wt.%; Ti: 0.25wt.%; Nb: 1.55wt.%; Ni: 0.9wt.%; Mn: 0.8wt.%; Si: 0.6wt.%; Fe: balance. The EBSD diagram of the obtained surfacing deposited metal is shown in figure 2 , XRD diagram see image 3 .

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Abstract

An iron-based overlaying flux-cored welding wire for abrasion-resistant belts of drill pipe joints belongs to the field of welding materials for processing materials. Flux core powder is wrapped by a carbon steel strip, the filling rate of the flux-cored welding wire ranges from 20% to 35%, and the flux core powder comprises substances, by mass percentage, including from 15 to 27% of ferroboron, from 0.6 to 2.3% of titanium powder, from 8.5 to 18.5% of ferroniobium, from 4.5 to 7.5% of nickel powder, from 4 to 6% of electrolytic manganese powder, from 4 to 18% of ferrosilicon, from 2.5 to 7% of graphite and the balance iron powder. Overlaying technological parameters are set, voltage ranges from 26V to 29V, current ranges from 260A to 290A, wire feeding speed ranges from 430mm/min to 460mm/min, gas flow rate ranges from 18L/min to 23L/min, and the welding wire extends out of a contact tube by the length ranging from14mm to 28mm. The iron-based overlaying flux-cored welding wire does not contain chromium elements, is an environment-friendly welding material, has comprehensive performances of high abrasion resistant and high cracking resistance, and is fine in overlaying manufacturability, and weld joints are attractive in shape.

Description

technical field [0001] The invention belongs to the field of welding materials for material processing, and in particular relates to a wear-resistant band flux-cored welding wire for surfacing welding drill pipe joints. Background technique [0002] With the development of modern drilling technology, a large number of ultra-deep wells, highly deviated wells, and extended-reach wells have appeared, which has brought about a series of problems such as prolonged drilling time and increased lateral force of the drill pipe on the casing. The problem of casing wear is becoming more and more prominent. The emergence of drill pipe joint wear-resistant band has played a key role in solving this problem. The wear-resistant band of the drill pipe joint has better wear resistance than the joint itself, and can reduce the wear on the casing. Therefore, the wear-resistant band technology has been more and more used in drilling, and has become a major international oil exploration and pro...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K35/368B23K9/04C22C38/00
Inventor 贺定勇周正刘希学蒋建敏王智慧崔丽李晓延
Owner BEIJING UNIV OF TECH
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