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Methods for welding austenitic alloy steel and preparing non-magnetic drill collar by utilizing linear friction welding technology

A linear friction welding and linear friction welding technology, which is applied in the direction of welding/welding/cutting items, welding equipment, non-electric welding equipment, etc., can solve the problems of difficult repair of failed drill collars, low production efficiency, waste of materials, etc., and achieve mechanical properties Excellent, stable welding quality, and the effect of reducing the cost of use

Inactive Publication Date: 2018-11-16
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention proposes a method for processing and repairing non-magnetic drill collars by linear friction welding technology, so as to improve the problems of material waste, high cost and low production efficiency in the existing processing methods, and overcome the difficulty of repairing failed drill collars problem; at the same time, the austenitic alloy steel is welded by this process method; for such thick-walled pipe fittings as non-magnetic drill collars, the present invention proposes for the first time the use of linear friction welding to produce and repair non-magnetic drill collars, and the prepared The mechanical properties of non-magnetic drill collars fully meet the requirements of the American Petroleum Institute (API)

Method used

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  • Methods for welding austenitic alloy steel and preparing non-magnetic drill collar by utilizing linear friction welding technology
  • Methods for welding austenitic alloy steel and preparing non-magnetic drill collar by utilizing linear friction welding technology
  • Methods for welding austenitic alloy steel and preparing non-magnetic drill collar by utilizing linear friction welding technology

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Experimental program
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Effect test

Embodiment 1

[0051] Such as figure 2 , 3 Shown, a kind of linear friction welding process prepares the method for non-magnetic drill collar, comprises the steps:

[0052] (1) Welding interface treatment: Austenitic alloy steel (composition as shown in Table 1) is made into a workpiece with an outer diameter of φ104.8mm, a wall thickness of 20mm, and a length of 300mm, and the oxide skin on the interface of the workpiece to be welded is cleaned with sandpaper At the same time, use alcohol and acetone to remove oil stains on the interface to be welded;

[0053] (2) Welding clamping: install the workpiece in step (1) into the HWI-LFW-30 linear friction welding machine, and clamp a workpiece in the movable end fixture 4 and the vibration end fixture 1 of the welding machine (workpiece 2 at the vibration end, workpiece 3 at the mobile end), and ensure that workpieces 2 and 3 are coaxial with the fixture at the vibration end and the fixture at the mobile end; set the vibration frequency of th...

Embodiment 2

[0056] The preparation method is the same as that in Example 1, the difference is that the workpiece has an outer diameter of φ228.6 mm, a wall thickness of 80 mm, and a length of 300 mm. The vibration frequency of the workpiece at the vibrating end is 200 Hz, the amplitude is 5 mm, the friction pressure is 300 MPa, and the upsetting pressure is 200 Hz. It is 600MPa, the friction time is 15s, and the holding time is 30s.

Embodiment 3

[0058] The preparation method is the same as in Example 1, except that the vibration frequency of the workpiece at the vibrating end is 5 Hz, the amplitude is 4 mm, the friction pressure is 300 MPa, the upsetting pressure is 500 MPa, the friction time is 5 s, and the pressure holding time is 5 s.

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Abstract

The invention relates to methods for welding austenitic alloy steel and preparing a non-magnetic drill collar by utilizing a linear friction welding technology. The methods comprise the steps that workpieces made of the austenitic alloy steel are clamped into a friction welding machine, then the workpieces in clamps at the vibration end and the moving end are welded, when welding is started, the workpiece at the moving end moves towards the workpiece at the vibration end, at the moment, the workpiece at the vibration end begins to vibrate, after the workpiece at the vibration end makes contactwith the workpiece at the moving end, friction heat generation begins under action of the friction pressure, when the friction time reaches the set value, vibration stops, upset forging begins to beconducted, upset forging pressure is applied to the workpieces in the axial direction of the workpieces and maintained, after the upset forging pressure is released, the workpieces are taken out, andthus the non-magnetic drill collar is obtained. According to the methods for welding the austenitic alloy steel and preparing the non-magnetic drill collar by utilizing the linear friction welding technology, the mode that the non-magnetic drill collar is machined and repaired through the linear friction welding technology is proposed so as to solve the problems that as for an existing machining method, materials are wasted, the cost is high and the production efficiency is low, and overcome the defect that the invalid drill collar is difficult to repair.

Description

technical field [0001] The invention belongs to the application field of linear friction welding technology, and in particular relates to the welding and repairing method of austenitic alloy steel special-shaped surface structural parts and non-circular cross-section non-magnetic drill collars realized by linear friction welding technology. Background technique [0002] Oil and gas field drilling and production technology has developed rapidly in recent decades, and the drilling depth of land and sea has reached the level of several thousand meters. In order to ensure sufficient vertical drilling accuracy, measurement-while-drilling devices are widely used in the field of deep drilling. The measurement-while-drilling device corrects its vertical accuracy by sensing the geomagnetic field of the borehole to ensure the accuracy of the vertical well drilling direction. Drilling tools are generally magnetic. In order to prevent the magnetic field generated during high-speed dril...

Claims

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Application Information

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IPC IPC(8): B23K20/12B23K20/24B23K20/26B23K103/04
CPCB23K20/122B23K20/1205B23K20/24B23K20/26
Inventor 秦国梁杨帆
Owner SHANDONG UNIV
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