Seamless steel pipe welding requirements

      First clean the oil, paint, water, rust, etc. of the weld, and then open the groove according to the wall thickness, the thicker will open larger, the thin will open smaller (angle grinder) Then there is the gap of the product, usually 1-1.5 times the diameter of the electrode or wire. If you accidentally open the groove, you can leave it smaller. Point welding is at least three points, generally four points are better. When welding, it should be welded in half and half, and the starting point should be better than about one centimeter of the bottom point, so that the joint is good from the opposite side. If the wall thickness is thick, it should be layered, at least two layers, and the second layer can be welded after the first layer is completely welded.
　　
　　Seamless Steel Tube Plant shares the latest seamless steel pipe implementation standards at the end of 2014
　　
　　[1] Structural seamless pipe (GB/T8162-2008) is a seamless steel pipe used for general structural and mechanical structures.
　　
　　[2] Seamless steel pipe for fluid transportation (GB/T8163-2008) is a general seamless steel pipe for conveying fluids such as water, oil and gas.
　　
　　[3] Seamless steel pipe for low and medium pressure boilers (GB3087-2008) is a high-quality carbon structural steel for the manufacture of superheated steam pipes, boiling water pipes and superheated steam pipes and arch bricks for various medium and low pressure boilers. Hot rolled and cold drawn (rolled) seamless steel tubes.
　　
　　[4] Seamless steel pipe for high-pressure boilers (GB5310-2008) is a high-quality carbon steel, alloy steel and stainless steel heat-resistant steel seamless pipe for the heating surface of water tube boilers for high pressure and above.
　　
　　[5] High-pressure seamless steel pipe for chemical fertilizer equipment (GB6479-2000) is a high-quality carbon structural steel and alloy steel seamless steel pipe suitable for chemical equipment and pipelines with working temperature of -40~400 °C and working pressure of 10~30Ma. .
　　
　　[6] Seamless steel pipe for petroleum cracking (GB9948-2006) is a seamless pipe for furnace tubes, heat exchangers and pipes suitable for petroleum refineries.
　　
　　[7] Steel pipe for geological drilling (YB235-70) is a steel pipe used for geological drilling by the geological department. It can be divided into drill pipe, drill collar, core pipe, casing and sedimentation pipe according to the application.
　　
　　[8] Seamless steel pipe for diamond core drilling (GB3423-82) is a seamless steel pipe for drill pipe, core rod and casing used for diamond core drilling.
　　
　　[9] Oil drilling pipe (YB528-65) is a seamless steel pipe used for thickening or external thickening at both ends of oil drilling. There are two kinds of steel pipe and no wire, the wire pipe is connected by a joint, and the non-wire pipe is welded by a butt welding method and a tool joint.
　　
　　[10] Carbon steel seamless steel pipe for ships (GB5213-85) is a carbon steel seamless steel pipe for the manufacture of ship class I pressure pipe system, class II pressure pipe system, boiler and superheater. The working temperature of the carbon steel seamless steel pipe wall does not exceed 450 ° C, and the working temperature of the alloy steel seamless steel pipe wall exceeds 450 ° C.
　　
　　[11] Seamless steel pipe for automobile semi-axle casing (GB3088-82) is a high-quality carbon structural steel and alloy structural steel hot-rolled seamless steel pipe for manufacturing automobile semi-axle casing and axle axle of drive axle.
　　
　　[12] High-pressure oil pipe for diesel engine (GB3093-2002) is a cold drawn seamless steel pipe for the manufacture of high-pressure pipes for diesel injection systems.
　　
　　[13] Precision inner diameter seamless steel pipe for hydraulic and pneumatic cylinders (GB8713-88) is a cold drawn or cold rolled precision seamless steel pipe with precision inner diameter for hydraulic and pneumatic cylinders.
　　
　　[14] Cold drawn or cold rolled precision seamless steel pipe (GB3639-2000) is a cold drawn or cold rolled precision seamless steel pipe with high dimensional accuracy and good surface finish for mechanical structures and hydraulic equipment. The use of precision seamless steel tubes to manufacture mechanical structures or hydraulic equipment can greatly reduce machining time, improve material utilization, and improve product quality.
　　
　　[15] Stainless steel seamless steel pipe for structure (GB/T14975-2002) is hot-rolled stainless steel widely used in corrosion-resistant pipes and structural parts and parts of chemical, petroleum, textile, medical, food, machinery and other industries. (Squeeze, expand) and cold drawn (rolled) seamless steel tubes.
　　
　　[16] Stainless steel seamless pipe for fluid transportation (GB/T14976-2002) is a hot-rolled (extruded, expanded) and cold drawn (rolled) seamless steel pipe made of stainless steel for conveying fluid.
　　
　　[17] Shaped seamless steel pipe is a general term for seamless steel pipes of other cross-section shapes other than round pipes. According to the shape and size of the cross-section of the steel pipe, it can be divided into the same wall thickness profiled seamless steel pipe (code D), the unequal wall thickness profiled seamless steel pipe (code BD), and the variable diameter profiled seamless steel pipe (code BJ). Shaped seamless tubes are widely used in a variety of structural parts, tools and mechanical parts. Compared with the round pipe, the special-shaped pipe generally has a large moment of inertia and a section modulus, and has a large bending and torsion resistance, which can greatly reduce the structural weight and save steel.
　　
　　[18] Seamless steel pipe for low temperature pipeline (GB/T18984-2003) is suitable for -45 ° C ~ -195 ° C low temperature pressure vessel pipe and low temperature heat exchanger pipe seamless steel pipe.
　　
　　Seamless steel tubes for the manufacture of pipes, vessels, equipment, fittings and mechanical structures
　　
　　Construction: hall structure, sea trestle, airport structure, dock, security door frame, garage door, reinforced steel doors and windows, indoor partition wall, cable tray structure and highway security guard, railing, decoration, residential, decorative pipeline
　　
　　China Seamless Pipe Network Xiaobian learned: auto parts: car and bus manufacturing, transportation
　　
　　Agriculture: Agricultural equipment
　　
　　Industry: Machinery, Solar Mounts, Offshore Oilfields, Mining Equipment, Electromechanical Hardware, Engineering, Mining, Heavy and Resource, Process Engineering, Materials Processing, Mechanical Parts
　　
　　Transportation: pedestrian railings, guardrails, square structures, guiding signs, road equipment, fences
　　
　　Logistics warehousing: supermarket shelves, furniture, school equipment