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  • 螺旋钢管在出厂前需要做哪些检查?
  • 本站编辑:杭州元博钢铁有限公司 发布日期:2018-07-31 13:46 浏览次数:

杭州螺旋钢管05

螺旋钢管在出厂之前应做机械性能试验和压扁试验以及扩口试验,并要达到标准规定的要求。
The spiral steel pipe shall be subjected to mechanical property test, flattening test and flattening test before leaving the factory, and shall meet the requirements of the standard.
1、从表面上判断,也就是在外观检验:焊接接头的外观检验是一种手续简便而又应用广泛的检验方法,是成品检验的一个重要内容,主要是发现焊缝表面的缺陷和尺寸上的偏差。一般通过肉眼观察,借助标准样板、量规和放大镜等工具进行检验。若焊缝表面出现缺陷,焊缝内部便有存在缺陷的可能。
1. Judging from the surface, it is also in appearance inspection: the appearance inspection of the welded joint is a simple and widely used inspection method. It is an important part of the inspection of the finished products, mainly to find the defects on the weld surface and the deviation in the size. Through naked eye observation, with standard sample, gauge and magnifying glass and other tools for inspection. If there are defects on the weld surface, there may be defects in the weld.
2、物理方法的检验:物理的检验方法是利用一些物理现象进行测定或检验的方法。材料或工件内部缺陷情况的检查,一般都是采用无损探伤的方法。无损探伤有超声波探伤、射线探伤、渗透探伤、磁力探伤等。
2. Testing physical methods: physical testing is a method of testing or testing with some physical phenomena. Inspection of internal defects of materials or workpieces is usually done by NDT. NDT includes ultrasonic flaw detection, radiographic inspection, penetrant flaw detection and magnetic flaw detection.
3、受压容器的强度检验:受压容器,除进行密封性试验外,还要进行强度试验。常见有水压试验和气压试验两种。它们都能检验在压力下工作的容器和管道的焊缝致密性。气压试验比水压试验更为灵敏和速,同时试验后的产品不用排水处理,对于排水困难的产品尤为适用。但试验的危险性比水压试验大。进行试验时,必须遵守相应的安全技术措施,以防试验过程中发生事故。
3. Strength test of pressure vessels: pressure vessels should be subjected to strength test besides sealing test. There are two kinds of water pressure test and air pressure test. They can check the weld density of vessels and pipes working under pressure. The air pressure test is more sensitive and faster than the water pressure test, and the test products do not need drainage treatment, especially for the products with difficult drainage. But the risk of the test is larger than that of water pressure test. In the course of testing, safety technical measures must be followed to prevent accidents during the test.
4、致密性检验:贮存液体或气体的焊接容器,其焊缝的不致密缺陷,如贯穿性的裂纹、气孔、夹渣、未焊透和疏松组织等,可用致密性试验来发现。致密性检验方法有:煤油试验、载水试验、水冲试验等。
4. Densification test: the welding container for storing liquid or gas, the undense defects of its weld, such as penetrating cracks, pores, slag, unsoldering and loose tissue, can be found by compactness test. The compactness test methods include kerosene test, water carrying test and water impact test.
5、静水试验:每根钢管应做静水压试验而无渗漏现象,试验压力按下试计算 P=2ST/D 式中S—静水压试验的试验应力Mpa,静水试验的试验应力按相应钢带标准规定屈服度最小值(Q235为235Mpa)的60%选取。 稳压时间:D<508试验压力保持时间不少于5秒; D≥508试验压力保持时间不少于10秒 4 无损检测 钢管的补焊焊缝、钢带对头焊缝及环向缝应进行X射线或超声波检验。对于可燃普通流体输送用的钢向的螺旋焊缝应进行100%SX射线或超声波检验,对用于水、污水、空气、采暖蒸汽等普通流体输送用的钢管的螺旋焊缝应进行X射线或超声波检验抽查(20%)。
5, static water test: each steel pipe should be static water pressure test without leakage, test pressure is pressed to calculate the test stress Mpa in P=2ST/D S static water pressure test, and the test stress of static water test is selected according to the minimum yield of the corresponding steel band standard (Q235 235Mpa). Steady pressure time: D<508 test pressure retention time not less than 5 seconds; D > 508 test pressure retention time not less than 10 seconds 4 nondestructive testing of steel pipe weld seam, steel strip to the head weld and circumferential seam should be X ray or ultrasonic inspection. 100%SX - ray or ultrasonic inspection should be carried out for the spiral welds used for the transport of flammable ordinary fluids. The spiral welds of steel pipes used for ordinary fluid transportation, such as water, sewage, air, heating steam, etc., should be examined by X ray or ultrasonic inspection (20%).

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