Positioning device for cement head welding and its application method
A technology for positioning parts and pre-welding, which is applied in the direction of auxiliary devices, welding equipment, auxiliary welding equipment, etc., can solve the problems of uncontrollable axial direction, discrepancy of cylinder arc, sag, etc., and achieve the effect of reliable positioning and simple structure
Active Publication Date: 2015-09-02
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
However, before welding, the union joint and the retaining pin base are in a free state at the connection hole of the seamless steel pipe cylinder, the concave axis of the union joint and the retaining pin base is inconsistent with the seamless steel pipe cylinder axis, and the axial direction cannot be controlled. It is easy to cause the union joint and the pin base to protrude or sag in the seamless steel tube
[0004] In addition, the diameter of the concave surface of the union tube and the retaining pin is different from the diameter of the inner diameter of the seamless steel tube, and the radial direction cannot be controlled, which may easily cause the concave surface of the union tube and the retaining pin to be inconsistent with the arc of the seamless steel tube
Method used
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[0039] Utilizing the pre-welding positioning device 100 according to the present invention, two experimental weldings were carried out in the mechanical processing plant of Dezhou Continental Shelf Petroleum Engineering Technology Co., Ltd., Sinopec Petroleum Engineering Technology Research Institute, namely "the experimental welding of 5" DS50 single plug cement head" and "Test Welding of Type 13 3 / 8" DS35 Double Plug Cement Head".
[0040] The test results show that after welding, the inner wall of the main body, the arc of the union tube and the base of the retaining pin are in the same arc position, basically on the same cylindrical surface, and the use effect is good.
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The invention provides a pre-welding positioning device for welding a hollow tubular workpiece with a concave arc end face to a side hole of a cylindrical tube body. The positioning device for the welding of the well cementation cement head comprises a base, a positioning piece and a screw rod. The screw rod can penetrate through a threaded hole of a positioning piece in a screwed mode and is connected with the base body, the base and the positioning piece are pushed to move in the opposite direction, and therefore a first protruding arc face R1 and a second protruding arc face R2 fit the inner wall of the tube body, and the second protruding arc face R2 is aligned to the side hole. The positioning device for the welding of the well cementation cement head solves the pre-welding positioning problem of welding cylindrical workpieces such as a union connecting pipe or a backing pin to the cement head cylinder. The fact that the manufactured cement head has a good inner-hole arc radian is ensured.
Description
technical field [0001] The invention relates to a pre-weld positioning device for welding a hollow tubular workpiece with a concave arc end surface in a side hole of a cylindrical pipe body, in particular to a union or stop pin used in the production process of the cement head Welding positioning device welded on the pipe body. Background technique [0002] As we all know, the cement head is a tool for oil drilling and cementing, and its production process mostly uses welding methods. That is, a round hole is opened on the seamless steel pipe, and a union joint and a retaining pin are respectively welded on. Since the inner wall of the seamless steel pipe is arc-shaped, in order to keep the cement head made with a better inner hole arc, the base of the union joint and the retaining pin must also be arc-shaped. Otherwise, the rubber plug will be easily damaged during the cementing operation, which will seriously affect the cementing quality. [0003] At present, when the c...
Claims
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IPC IPC(8): B23K37/04
CPCB23K37/053B23K2101/06
Inventor 陈佃阳孔博詹美玲郭勇熊新荣陈武君
Owner CHINA PETROLEUM & CHEM CORP