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Axial friction welding process method of high-nitrogen austenitic stainless steel and non-magnetic drill collar

A high-nitrogen austenite and non-magnetic drill collar technology, which is applied in welding equipment, manufacturing tools, non-electric welding equipment, etc., can solve the problems of low production efficiency, material waste, and high cost

Inactive Publication Date: 2018-11-30
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention proposes a method for processing and repairing non-magnetic drill collars with an axial friction welding process and an inertial axial friction welding process, so as to improve the problems of material waste, high cost and low production efficiency of the existing processing methods, and Overcome the problem that the failed drill collar is difficult to repair

Method used

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  • Axial friction welding process method of high-nitrogen austenitic stainless steel and non-magnetic drill collar
  • Axial friction welding process method of high-nitrogen austenitic stainless steel and non-magnetic drill collar
  • Axial friction welding process method of high-nitrogen austenitic stainless steel and non-magnetic drill collar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] like Figure 2-4 Shown, a kind of continuous drive axial friction welding process prepares the method for non-magnetic drill collar, comprises the steps:

[0073] (1) Welding interface treatment: make high-nitrogen austenitic stainless steel (composition as shown in Table 1) into a workpiece with an outer diameter of φ104.8mm, a wall thickness of 20mm, and a length of 300mm, and use sandpaper to clean the oxidation on the interface of the workpiece to be welded At the same time, use alcohol and acetone to remove oil stains on the interface to be welded;

[0074] (2) Weldment clamping: install the workpiece clamp in step (1) in the HSMZ-130 type axial friction welding machine, and respectively clamp a workpiece in the movable end clamp 13 and the rotating end clamp 14 of the welding machine ( Rotary end workpiece 8, mobile end workpiece 9), and ensure that workpieces 8 and 9 are coaxial with the rotary end fixture and the movable end fixture; through the control system ...

Embodiment 2

[0077] like Figure 2-4 Shown, a kind of inertial axial friction welding process prepares the method for non-magnetic drill collar, comprises the steps:

[0078] (1) Welding interface treatment: high nitrogen austenitic stainless steel (composition as shown in Table 1) is made into the outer diameter For workpieces with a wall thickness of 80mm and a length of 300mm, use sandpaper to clean the oxide skin on the interface of the workpiece to be welded, and use alcohol and acetone to remove oil stains on the interface to be welded;

[0079] (2) Weldment clamping: the workpiece clamp in step (1) is installed in the HSMZ-130 type axial friction welding machine, and a workpiece is respectively clamped in the moving end clamp 13 and the rotating end clamp 14 of the welding machine ( Rotary end workpiece 8, mobile end workpiece 9), and ensure that workpieces 8 and 9 are coaxial with the rotary end fixture and the movable end fixture; set the initial speed of the flywheel to 2000rad / ...

Embodiment 3

[0082] The preparation method is the same as in Example 1, except that the spindle speed is 2500 rad / min, the friction pressure is 50 MPa, the upsetting pressure is 600 MPa, the friction deformation is 3 mm, and the holding time is 15 s.

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Abstract

The invention relates to an axial friction welding process method of a high-nitrogen austenitic stainless steel and non-magnetic drill collar and belongs to the field of preparation of oil-gas drilling tools. The method comprises the application steps: workpieces made from high-nitrogen austenitic stainless steel are clamped into a friction welding machine, then, workpieces in a clamp of a rotating end and a clamp of a moving end are welded, the workpiece of the moving end moves towards the workpiece of the rotating end when welding is started, at this time, the workpiece of the rotating end starts to rotate, the workpiece of the rotating end and the workpiece of the moving end start to produce heat due to friction under the action of frictional pressure after contact, rotation is stoppedwhen a friction amount of deformation reaches a set value, upset forging is started, upset forging pressure is applied to the workpieces along the axial direction of the workpieces and is maintained,and a workpiece is taken out after the upset forging pressure is unloaded, thereby obtaining the non-magnetic drill collar. According to the method, the non-magnetic drill collar is processed and repaired by an axial friction welding method, so that the problems, i.e., material waste, relatively high cost and relatively low production efficiency of the existing processing methods are improved, andthe problem that a failed drill collar is difficult to repair is solved.

Description

technical field [0001] The invention belongs to the application field of axial friction welding technology, and specifically relates to a non-magnetic drill for high-nitrogen austenitic stainless steel welding and exploration and development of oil and gas resources and geological exploration by using continuous drive axial friction welding technology and inertial axial friction welding technology Collar welding and repair methods. Background technique [0002] In the deep drilling process of oil and natural gas, the non-magnetic drill collar is the most important part of the drill string. It is located under the drill string and has the functions of providing drilling pressure to the drill bit, improving the rigidity of the drill string and ensuring the measurement accuracy of the measurement-while-drilling device. function (as shown in the manual figure 1 shown). In order to ensure the drilling accuracy, oil and gas wells with large depths are equipped with measurement-w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12C22C38/58C22C38/42C22C38/44C22C38/46C22C38/02C22C38/06B23K101/04
CPCB23K20/1225B23K20/1245B23K20/129C22C38/001C22C38/02C22C38/06C22C38/42C22C38/44C22C38/46C22C38/58
Inventor 秦国梁杨帆李长安
Owner SHANDONG UNIV
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