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Method and device for welding drill pipe body and external key for rotary drilling

A drill pipe and rotary drilling technology is applied in the field of welding drill pipe bodies, foreign keys and devices for rotary drilling, and can solve problems such as cold cracking, deterioration of cold cracking phenomenon, and influence on welding quality.

Active Publication Date: 2014-10-29
SHANGHAI ZOOMLION HEAVY IND PILING MACHINERYCO +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These two types of steel are prone to deformation due to severe changes in local temperature during the welding process, resulting in cold cracking, which seriously affects the welding quality, and the different degrees of deformation of the drill pipe body and the external key made of different materials will also cause make cold cracking worse

Method used

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  • Method and device for welding drill pipe body and external key for rotary drilling
  • Method and device for welding drill pipe body and external key for rotary drilling
  • Method and device for welding drill pipe body and external key for rotary drilling

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Embodiment Construction

[0038] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0039] Such as figure 1 What is shown is a schematic cross-sectional view of the drill pipe body 11 and the outer key 12 for the welding rotary drilling drill to be welded. As noted above, the outer key 12 generally extends the entire length of the drill pipe body 11 . One or more external keys 12 can be arranged along the outer peripheral direction of the drill pipe body 11, such as figure 1 Three are shown. Two welding zones 13 (such as figure 1 shown), of course, only one welding zone 13 may be provided.

[0040] According to one embodiment of the present invention, a method for welding a drill pipe body and an outer key for rotary drilling is provided, ...

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Abstract

The invention discloses a method and a device for welding a drill pipe body for rotary drilling and outer keys. The method comprises the following steps of: a preheating step: preheating a welding area (13) between the drill pipe body (11) and each outer key (12); a welding step: welding the welding area (13) between the drill pipe body (11) and each outer key (12) to form a welding seam; and a post-heating step: heating the welding seam formed between the drill pipe body (11) and each outer key (12) after the welding step. The invention also discloses a device for welding the drill pipe body for the rotary drilling and the outer keys, which comprises a preheating unit (3), a welding unit (2) and a post-heating unit (4). By the technical scheme, the cold breaking phenomenon during the welding process of the drill pipe body and the outer keys can be effectively avoided. In addition, the welding stress and the welding deformation of the drill pipe body and the outer keys, caused after the preheating step and the post-heating step, can be effectively eliminated.

Description

technical field [0001] The invention relates to a welding method and a welding device, in particular to a method and a device for welding a drill pipe body and an external key for a rotary drilling drill. Background technique [0002] The rotary drilling rod of the rotary drilling rig usually includes a telescopic multi-section drill pipe body, and the multi-section drill pipe body is circumferentially connected by keys to transmit rotational torque joint by joint. More specifically, an outer key extending in the axial direction is arranged on the outer peripheral surface of the drill pipe body, and an inner key engaged with the outer key is arranged on the inner peripheral surface of the drill pipe body. The outer key typically extends the entire length of the drill pipe body, whereas the inner key may extend only part of the length of the drill pipe body. The length of the inner key is relatively short, so it can be arranged on the inner peripheral surface of the drill pi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K37/00B23K37/02
Inventor 杨涛周靖芦军薛顺孔丹丹王亚伟
Owner SHANGHAI ZOOMLION HEAVY IND PILING MACHINERYCO
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