Post-weld treatment device for welding of oil and gas pipelines

Abstract

The invention discloses a welding post-welding device for oil and gas pipeline welding. The welding post-welding device is not independently used and is used at the same time by multiple, directly sleeving the weld joint of a pipeline and the two sides of the weld joint, directly knocking the mechanical vibration formed by the two sides of the pipeline by directly knocking the force of the weld joint, so as to reduce internal stress in the weld joint, the welding post-welding device structurally comprises a transmission mechanism, a separation plate, a vibration part, a transmission mechanismand a vibration part, wherein the transmission mechanism and the vibration part are located on the two sides of the separation plate respectively, is fastened through a connecting bolt, a rotating block in the vibration part is in contact with the pipeline and rotates at a high speed along with the high-speed rotation of the transmission mechanism, the pipeline is continuously knocked, the mechanical vibration is formed on the pipeline, the transmission mechanism is mainly formed by meshing gears with different dividing circles with different diameters, the other gears are driven to rotate through the driving gears connected with a power device, meanwhile work is started, as the diameters of the dividing circles are different, the rotating speed of each minute is different, so that resonance is avoided.

Description

technical field [0001] The invention belongs to the technical field of pipeline welding equipment, and in particular relates to a post-weld treatment device for welding oil and gas pipelines. Background technique [0002] Since the welding is carried out at high temperature, when the metal is lowered from the high temperature, the structure of the welded joint and the heat-affected zone changes, which is prone to generate large thermal stress, and the residual stress caused by too fast cooling is easy to occur in the welded joint. The treatment will affect the use of the workpiece; the post-weld treatment method adopted in the prior art mainly proceeds from three aspects, one is tempering, and the workpiece is reheated until the pearlite in the workpiece is transformed into austenite, and the crystal lattice is readjusted , so as to eliminate the residual stress. The second is to carry out heat preservation after welding to avoid the thermal stress caused by the sharp drop i...

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Problems solved by technology

[0003] After the oil and gas pipeline is used for a period of time, the inner wall of the pipeline will inevitably be corroded and thinned or even leaked. However, the pipeline cannot be completely replaced, and the damaged part is often welded. The repair of the pipeline is carried out outdoors, so it is impossible to carry For large equipment such as tempering furnaces, there are relatively many defects in welded joints. In addition, if the pipeline is welded by the in-service welding method, the fluid flowing in the pipeline will take away the heat, so it is reduced by heating. The method of internal stress is very difficult, even if it is used, the energy consumption is very high

[0004] The September 2014 issue of the Chinese journal "Journal of Welding" disclosed that mechanical vibration can significantly improve the structure of high-strength steel welded joints, and the equipment used to generate mechanical vibration on the market is a vibrator, which can only process part of it at a time , the outer wall of the pipe is curved, the use of the vibrator is inconvenient and time-consuming

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