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Flat welding method for trihedral drill pipe

A welding method and drill pipe technology, applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the problems of easy fracture, enterprise production, operation cost and economic benefit impact, poor coaxiality of male and female joints, etc. , to ensure the coaxiality, solve the phenomenon of backwater, and eliminate the effect of stomata

Inactive Publication Date: 2017-11-24
河南誉金技术服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Triangular drill pipe is widely used in soft outburst coal seams, but during use, it is found that the coaxiality of the male and female joints is out of tolerance, and the drill pipe is bent at the joint, resulting in friction between the drill pipe and the copper sleeve of the guide sleeve, and easy to break at the weak point ; Seriously affected the production, operating costs and economic benefits of the enterprise

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for welding a triangular drill pipe with flat ends, the welding method comprising the steps of:

[0021] Step 1: Pre-welding treatment: remove scale, rust, oily impurities, moisture, etc. on the surface of the weldment;

[0022] Step 2: Body shaping: Shaping each part of the weldment for use;

[0023] Step 3: preheating before welding: preheat the weldment before welding, preheat each weldment at the same time, and monitor the temperature;

[0024] Step 4: Friction welding: Friction welding parameters are: primary friction pressure 2MPa, primary friction time 5s; secondary friction pressure 4.5MPa, secondary displacement 5mm; upsetting pressure 10 MPa, upsetting pressure holding time 9s;

[0025] Step 5: Heat treatment of the weld seam: adopt the treatment process of quenching and high temperature tempering to obtain tempered sorbite;

[0026] Step 6: Post-weld inspection: Ultrasonic inspection is performed on the weld joint of the triangular drill pipe after...

Embodiment 2

[0029] A method for welding a triangular drill pipe with flat ends, the welding method comprising the steps of:

[0030] Step 1: Pre-welding treatment: remove scale, rust, oily impurities, moisture, etc. on the surface of the weldment;

[0031] Step 2: Body shaping: Shaping each part of the weldment for use;

[0032] Step 3: preheating before welding: preheat the weldment before welding, preheat each weldment at the same time, and monitor the temperature;

[0033] Step 4: Friction welding: Friction welding parameters are: primary friction pressure 2.5MPa, primary friction time 5s; secondary friction pressure 5MPa, secondary displacement 5mm; upsetting pressure 10 MPa, upsetting pressure holding time 9s;

[0034] Step 5: Heat treatment of the weld seam: adopt the treatment process of quenching and high temperature tempering to obtain tempered sorbite;

[0035] Step 6: Post-weld inspection: Ultrasonic inspection is performed on the weld joint of the triangular drill pipe after...

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PUM

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Abstract

The invention discloses a flat welding method for a trihedral drill pipe. The welding method comprises the following steps of treating before welding, main body reshaping, preheating before welding, frictional welding, weld joint heat treating and detecting after welding. According to the welding method, through frictional welding, the concentricity and the straightness accuracy of the trihedral drill pipe are guaranteed, welding materials which need to be arranged in weld joints in a filling mode in manual electric welding are omitted, the phenomenon that pores are liable to be generated in the weld joints is eliminated, the strength of the trihedral drill pipe is improved, the production efficiency is improved by 15 times, the production cost is reduced, the labor intensity of workers is reduced, and environmental pollution brought by manual electric welding and harm to manual electric welding to health of the operating workers are eliminated.

Description

technical field [0001] The invention relates to the technical field of deep-hole water exploration and gas drainage drilling construction in hard rock layers and coal rocks in coal mine tunnels, and in particular relates to a flat-end welding method for triangular drill pipes. Background technique [0002] my country is a big energy country, and the output and reserves of coal resources are among the top in the world. As an industrial power fuel, coal is often used in power generation, transportation, metallurgy, etc.; at the same time, it is also a very important fuel for civil life; in addition, coal is also an important chemical raw material. After coking, distillation, etc., many important Chemical raw materials and their derivatives, such as gas, coal tar, nitrogen fertilizer, pesticides, plastics, synthetic fibers, and hundreds of other products, some coal seams contain rare or radioactive elements such as gallium, germanium, and uranium, which can be used comprehensiv...

Claims

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Application Information

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IPC IPC(8): B23K20/12B23K20/24
CPCB23K20/122B23K20/24
Inventor 王鹏王莉黎延许谢贵娟
Owner 河南誉金技术服务有限公司
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