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Trimming metallographic phase detection method of weld joint quality of petroleum drill rod inertia friction welding

An inertia friction welding and oil drill pipe technology, which is applied in the preparation of test samples, optical test flaws/defects, etc. It can eliminate the phenomenon of missed detection, simplify the process flow, and improve the work efficiency.

Inactive Publication Date: 2013-10-30
杜林 +4
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Problems solved by technology

However, due to the unresolved engineering and technical problems of ultrasonic testing in the positioning, quantification and qualitative aspects of defects, the accuracy and reliability of the detection are not very ideal, especially for the planar oxidation of oil drill pipe inertia friction welding joints. Inclusion defects often occur in missed inspections
Since the oil drill pipe is an important stress-bearing component, this kind of missed inspection is very likely to cause serious drilling accidents

Method used

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  • Trimming metallographic phase detection method of weld joint quality of petroleum drill rod inertia friction welding
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  • Trimming metallographic phase detection method of weld joint quality of petroleum drill rod inertia friction welding

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Embodiment Construction

[0013] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0014] The polishing grinding wheel 8, the grinding wheel motor 20 are connected with the polishing grinding wheel base 11, and are installed on the tool rest 12 of the lathe with fastening screws 10. Wherein the diameter of the polishing wheel 8 is Φ200mm. The metallographic microscope 4 is installed on the column guide rail 3 and the column screw 5; the eyepiece 27, the objective lens 25 and the focus adjustment knob 26 of the metallographic microscope 4 are all installed on the microscope support 24; the lifting nut 23 of the microscope links to each other with the column screw 5 , The microscope base guide rail 22 is connected with the column mounting plate 6 and the column screw 5; the column base 21 is connected with the lathe light bar 28, the lathe screw 15 and the lathe bed 19.

[0015] Clamp the oil drill pipe welded by inertia friction welding between chuc...

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Abstract

The invention relates to manufacture and repairation of a petroleum drill rod, and particularly relates to a trimming metallographic phase detection method of the weld joint quality of petroleum drill rod inertia friction welding. According to the invention, a sand wheel is polished by PVA (polyvinyl acetate) sponge, wherein the sand wheel has the diameter of Phi200, has the rotation speed of 1,500 revolutions per minute, and has the pressure of 3-4kg / cm<2>; a sand wheel motor has the power of 0.55KW; the drill rod speed is 3 revolutions per minute; the rotation direction of the sand wheel motor is opposite to that of the polished sand wheel; water and grinding paste are added in polishing, a weld joint can achieve the finish degree the same as that of the weld joint being corroded by 5% nitric acid alcohol water solution; when the weld joint is observed by a metallographic phase microscope, if a metallographic phase trimming root part has no obvious oxide impurity and is not welded thoroughly, the welding is favorable, otherwise, the weld joint is not qualified. According to the invention, the weld joint of petroleum drill rod inertia friction welding can be subjected to rapid metallographic phase detection in the production field; not only is the detection leakage in the ultrasonic detection of defects of weld joint facet oxides eliminated, but also the technology process is simplified; the working efficiency is improved. The trimming metallographic phase detection method of the welding quality of petroleum drill rod inertia friction welding is much suitable for the petroleum production industry.

Description

technical field [0001] The invention relates to the manufacture and repair of an oil drill pipe, in particular to a flash metallographic detection method for the quality of an inertia friction welding seam of an oil drill pipe. Background technique [0002] At present, the ultrasonic non-destructive testing method is mainly used at home and abroad to test the weld quality of inertial friction welding of oil drill pipes. However, due to the unresolved engineering and technical problems of ultrasonic testing in the positioning, quantification and qualitative aspects of defects, the accuracy and reliability of the detection are not very ideal, especially for the planar oxidation of oil drill pipe inertia friction welding joints. Inclusion of defects in objects often leads to missed inspections. Since the oil drill pipe is an important force-bearing component, this kind of missed inspection is very likely to cause serious drilling accidents. Contents of the invention [0003...

Claims

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Application Information

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IPC IPC(8): G01N21/88G01N1/32
Inventor 杜林许林民钟金富刘金虎杨思乾
Owner 杜林
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