Welding optimization process for steel casting of oil pumping unit

A welding process and steel casting technology, which is applied in the field of welding optimization process of pumping unit steel castings, can solve the problems of poor casting structure and casting residual stress, incomplete heat treatment, low welding seam strength, etc. Residual stress, optimized process welding, and the effect of reducing the generation of hardened structures

Inactive Publication Date: 2012-06-20
江苏明宇石油机械有限公司
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Problems solved by technology

[0010] Compared with the traditional welding process, the process of the present invention solves defects such as incomplete heat treatment of steel castings before leaving the factory, poor casting structure and casting residual stress, and preheats before welding to reduce residual stress and hardening after welding. The formation of the structure solves the problems such as low weld strength and cracking

Method used

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Embodiment Construction

[0012] This specific embodiment adopts the following technical scheme: its welding process is: 1, the cast steel workpiece to be welded is placed in the furnace to preheat, and the preheating temperature is 330-380 ° C; 2, the cast steel workpiece after preheating is welded Fixing; 3. Place the welded cast steel workpiece in the furnace until it cools down.

[0013] Compared with the traditional welding process, the process of this specific embodiment solves defects such as incomplete heat treatment of steel castings before leaving the factory, unfavorable casting structure and casting residual stress, and preheating before welding reduces the residual stress and residual stress after welding. The production of hardened structure solves the problems of low weld strength and cracking.

[0014] This specific embodiment adopts optimized welding process, which can eliminate stress, reduce composition changes, make the welded part not easy to break, and prolong the service life of ...

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Abstract

The invention discloses a welding optimization process for a steel casting of an oil pumping unit, relating to the technical filed of a machining process for parts of the oil pumping unit of an oil well. The welding optimization process comprises the following steps of: (1), putting a steel casting workpiece to be welded in a furnace for preheating; (2), welding the preheated steel casting workpiece for fixing; and (3), putting the welded steel casting workpiece in the furnace till the steel casting workpiece is cooled. The preheating temperature in the step (1) is 330-380 DEG C. According to the invention, an optimization process is adopted for carrying out welding, such that the stress is removed, the compositional variation is reduced, the welding position is hard to break, and the service life of a load bearing member of the oil pumping unit is prolonged.

Description

Technical field: [0001] The invention relates to the technical field of processing technology for oil well pumping unit accessories, in particular to a welding optimization process for steel castings of a pumping unit. Background technique: [0002] The beam pumping unit is the main model of oil production machinery in the oil field, and the donkey head rope frame is an important stress-bearing component on the beam pumping unit. Its material is ZG 230-450, and it is connected with other parts by all-position welding. Among them, two sides form a fillet weld with the donkey head side plate, one side forms a lap weld with the supporting angle steel, and the other side forms two butt welds with the two panels respectively. The welding material is E5016 welding rod and dried at 350°C. [0003] In the process of production and use, cracks sometimes appear on the fusion line near the rope frame body (steel casting) at the lap weld, and the whole donkey head part has to be replace...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K37/00
Inventor 田正兵周友余潘美官
Owner 江苏明宇石油机械有限公司
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