The seamless pipe mill in Shandong analyzes the straight seam steel pipe and the spiral steel pipe of the straight seam steel pipe and the spiral steel pipe. It is a kind of welded steel pipe. They are widely used in the national production and construction, and the straight seam steel pipe and the spiral steel pipe have different production processes. There are many differences, the following discussion of the difference between straight seam steel pipe and spiral steel pipe. Straight seam welded pipe production process is relatively simple, the main production process of high-frequency welding straight seam steel pipe and submerged arc welded straight seam steel pipe, straight seam pipe production efficiency, low cost and rapid development. The strength of spiral welded pipes is generally higher than that of longitudinal welded pipes. The main production process is submerged arc welding. Spiral steel pipes can produce welded pipes with different pipe diameters from blanks of the same width, and narrower blanks can also be used to produce larger diameter pipes. However, compared with the straight seam pipe of the same length, the length of the weld seam increases by 30 to 100%, and the production speed is low. Therefore, the smaller diameter welded pipe mostly adopts the straight seam welding, and the large diameter welded pipe adopts the spiral welding. In the industry, large-diameter straight seam steel pipe will use T-welding technology, that is, a short length of straight seam steel pipe will be butt jointed to meet the length required by the project, the probability of T-shaped welding straight seam steel pipe defects is also greatly improved, and T-welding The welding residual stress at the seam is large, and the weld metal is often in a three-dimensional stress state, increasing the possibility of cracking. LED solar street light uses solar energy as power supply to provide road lighting at night. It adopts high-efficiency LED light source design, which has high brightness, green environmental protection, easy installation, stable and reliable work, no cable laying, no conventional power consumption, long service life, etc. Solar led street light has many advantages, especially the controller of this product adopts multiple energy-saving circuit design, with overcharge, overdischarge, reverse connection, automatic light control device, comprehensively improve the LED luminous efficiency, and greatly save electricity. This solar street lamp uses solar panels to convert solar energy into electrical energy during the day to charge the battery, and discharges the battery at night to make the Led Lighting work. Solar street light is a green energy product that is strongly advocated and has been used in many road projects. solar street light, solar led street light, solar street lamp, best solar street lights, all in one solar street light GuangDong One World High-tech Co., Ltd. , https://www.maksdep.com
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