Friction Welding Method of Welded Heavy Drill Pipe

A friction welding and welding technology, which is applied to drill pipes, welding equipment, drill pipes, etc., can solve problems such as poor reliability, affecting the mechanical properties of welds, and low strength of welds and heat-affected zones

Inactive Publication Date: 2011-12-07
江苏融泰石油科技股份有限公司
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Problems solved by technology

According to the metallographic inspection report of the weld, it can be seen that the two materials of the pipe body and the joint are basically not fused in the weld area,...

Method used

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  • Friction Welding Method of Welded Heavy Drill Pipe
  • Friction Welding Method of Welded Heavy Drill Pipe

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Embodiment Construction

[0019] The chemical composition (mass percentage %) of the welded heavy drill pipe body is: C 0.38 / 0.43, Si 0.20 / 0.35, Mn 1.60 / 1.90, P≤0.020, S≤0.010, Fe balance. The chemical composition (mass percentage%) of the joint is: C 0.42 / 0.48, Si 0.15 / 0.30, Mn 0.90 / 1.20, P≤0.015, S≤0.010, Cr 0.95 / 1.20, Mo 0.20 / 0.30, Cu≤0.20, Fe . The difference between the above two materials is that the Mn content is obviously different, and the joint material also contains alloy elements such as Cr, Mo, and Cu. The processing steps of the method are:

[0020] 1. For welding outer diameter 5.13in, welding inner diameter 3.0in, welding area is 13.57in 2 When the welding parameters are: inertia: 11036.5lb.ft 2 , Speed: 920±20r / min, upsetting pressure: 1400±40psi, holding time: 35±1s, theoretical displacement: 0.625±0.1in. When welding with this welding parameter, the actual displacement is 0.616in, and the joint and the external flash of the pipe are basically the same.

[0021]...

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Abstract

The invention relates to a friction welding method of a welded heavy drill pipe. The process steps of the method are as follows: when the welding outer diameter is 5.13in, the welding inner diameter is 3.0in and the welding area is 13.57in2, the welding parameters are: inertia: 11036.5lb .ft2, rotating speed: 920±20r/min, upsetting pressure: 1400±40psi, holding time: 35±1s, theoretical displacement: 0.625±0.1in. When welding with this welding parameter, the actual displacement is 0.616in; or: when the welding outer diameter is 3.88in, the welding inner diameter is 2.06in, and the welding area is 8.45in2, the welding parameters are: inertia: 4600lb.ft2, speed: 1100±20r /min, upsetting pressure: 1300±40psi, holding time: 35±1s, theoretical displacement: 0.625±0.1in. When welding with this welding parameter, the actual displacement is 0.630in. In the present invention, since the friction welding adopts low inertia, high rotating speed, and low upsetting pressure, the two materials of the pipe body and the joint are well welded, and after the weld seam undergoes quenching and tempering heat treatment, there is no cracking in the bending sample clockwise or counterclockwise.

Description

technical field [0001] The invention relates to a friction welding method, in particular to a friction welding method of a welded heavy drill pipe. Background technique [0002] Petroleum drill pipe is the main tool for oil field drilling. The structure includes the pipe body and the joints at both ends of the pipe body. The pipe body and the joint are connected by inertia friction welding. The chemical composition (mass percentage %) of the pipe body and the joint is shown in Table 1: [0003] C Si mn P S Ni Cr Mo Cu Al Tube 0.24-0.30 0.20-0.35 1.05-1.2 ≤0.015 ≤0.008 ≤0.25 0.8-1.0 0.15-0.2 ≤0.2 0.005-0.04 connector 0.35-0.38 0.15-0.35 0.85-1.00 ≤0.015 ≤0.008 ≤0.25 0.90-1.20 0.28-0.33 ≤0.2 [0004] At present, the inertial and direct drive friction welding machine of the American Manufacturing Technology Company—400BX inertial friction welding machine is generally used. Taking the 5-inch G105 drill pipe as an examp...

Claims

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Application Information

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IPC IPC(8): B23K20/12E21B17/00
Inventor 马灵李森成超徐春霞
Owner 江苏融泰石油科技股份有限公司
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