Quality Control of LSAW Steel Pipe before Welding

　　Quality control of lsaw steel pipe before welding is:

　　1) First, make a good quality of raw materials, after passing inspection before being officially entered the construction site, and resolutely put an end to the use of substandard steel.

　　2) Followed by the management of welding materials. Check whether the welding materials for qualified products, storage and baking system whether to perform, whether to issue a weld surface clean and free of rust, electrode coating is intact, with or without mildew.

　　3) Once again, clean weld zone management. Cleaning QA weld zone, without water, oil, rust and dirt oxide film, which is to prevent external weld defects produced an important role.

　　4) Select the appropriate welding method should be implemented first test welding, after welding principles.

评论

发表评论

此博客中的热门博文

Welding defects of seamless steel tube

　　The seamless steel tube is still quite a substitute in the production process. The reason for this situation of the seamless steel tube is that the forming gap changes too much, there are small burrs or small gaps on the edge of the strip, the forming is wrong, the welding wire diameter is uneven, and the welding wire joint. Unsmooth, uneven hardness of the wire causes uneven wire feeding, and metal burrs cause instant shorts at the tip. In this case, there is no need to make large adjustments, and the edge of the strip can be smoothed when conditions permit, and the molding can be kept stable. 　　The seamless steel tube is a pipe material whose welding seam is basically parallel to the steel pipe. The production process is simple, the production efficiency is high, the cost is low, and the development is fast. Generally, the curvature of the free side is ideal, but the delivery side is different. Due to the limitation, the deformation on the delivery side is not as good as the defo...
阅读全文

Characteristics and advantages of product oil pipeline transportation in oil casing

    The refined oil pipelines in petroleum pipelines are mainly used to transport refined petroleum products to petroleum sales companies, or pipelines that transport semi-refined petroleum products to refining and chemical enterprises. The solidification point of the refined oil is relatively low, and no heat treatment is required.At the same time, the type of oil to be delivered is large, the batch is large, and the number of oil separation points is often in the form of sequential delivery. Oil storage or distribution oil storage in Xiaoling area.     The pipeline process of product oil pipeline transportation is: oil terminal, oil depot, long-distance oil product pipeline, refinery, oil depot, long-distance oil product pipeline, petroleum sales company.     For the transportation of natural gas pipelines in oil pipelines, because of the high shipping cost of natural gas compression tanks, direct pipeline transportation is usually adopted after the g...
阅读全文

Adjustable steel props

　　 Xinyue Steel have export hundreds of containers of adjustable steel props to middle east, south Africa in 2017 already. We’ll have a brief introduction about adjustable steel props’application, components, surface treatment, advantages. 　 　Application: used for vertical supporting of slab framework and beam, for any shape building construction, foe different height of buildings within its range. 　 　Components: adjustable vertical pipe support include inner tube, prop base plate, prop nut, prop thread and lock pin. 　 　Surface treatment: dipped painting, powder coated, galvanized. 　　Advantage: 　　1. Simple and reliable structure 　　2. Easy to erect and dismantle 　　3. Strong loading capacity 　　4. Economical construction equipment 　　5. Easy to get through 　　6. Length adjustable.
阅读全文