Testing method for verifying reliability of tee joint welding process

Abstract

A testing method for verifying the reliability of a tee joint welding process comprises the following steps that a blank tube for manufacturing a tee joint is welded, and a blank welding seam is formed in the blank tube; no less than two sets of testing welding grooves are formed in the blank tube through arc air gouging; the welding process different from the welding process in the first step is used for welding each set of the testing welding grooves to form testing welding seams; different welding processes are used for welding one set of the testing welding grooves and another set of the testing welding grooves; when manufacturing and testing of the tee joint are completed and evaluating is conducted, testing evaluating of the welding process is conducted on each testing welding seam; the most appropriate welding process is chosen to be the welding process of final normal production. The testing method for verifying the reliability of the tee joint welding process greatly saves the evaluating time of the trial production of the tee joint, and improves the production efficiency. The time for tee joint evaluating is greatly shortened, and the cost of welding evaluating and testing of the high-strength tee joint can be greatly lowered.

Description

technical field [0001] The invention relates to the technical field of oil and natural gas transmission equipment, in particular to a method for verifying the reliability of a three-way welding process. Background technique [0002] Tee (such as figure 1 Shown) types can be roughly divided into four types according to different forms: welded tees, extruded tees, forged tees and cast tees. Casting tees are prone to casting defects such as trachoma, and the welding performance of cast steel is poor, so they are mainly used in non-high-pressure industrial and mining conditions; welding tees have high requirements for welding technology, and welding defects are easy to form at fillet welds, and internal quality control It needs further development and improvement of the existing detection technology, and the welds at the joints of the main and branch pipes are particularly sensitive to bending stress, and there is a large quality risk in the use under high pressure conditions; ...

AI Technical Summary

Problems solved by technology

[0005] Weld quality is affected by various factors such as welding materials, welding current, welding voltage, welding speed, welding personnel, etc. Defects such as incomplete penetration, incomplete fusion, pores, undercuts, and cracks may appear in the weld, especially for production The thick plate used in the large-diameter tee not only requires high welding technology for the weld seam, but also requires that the strength and toughness of the weld seam must meet the requirements of the tee product standard after repeated thermoforming of the tee. The manufacture of strong and large-diameter tees is a challenge in terms of technology and cost control

[0006] Depend on figure 2 It can be seen that the tee manufacturing process is not only long and complicated, but also consumes a lot of time and energy. Therefore, the quality of the tee welding is very important. When evaluating the process reliability, as long as the welding process is slightly inappropriate, it may fail. As a result, the process evaluation fails, and then it is necessary to re-select welding materials, adjust welding parameters, and re-manufacture the tee, which will cause a lot of waste of money

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