First clean the oil, paint, water, rust, etc. of the weld, and then according to the wall thickness, the thicker the opening, the thinner the smaller the smaller (angle grinder), the product has a gap, generally The electrode or wire is 1-1.5 times the diameter. If you accidentally open the groove, you can put it a little smaller. There are at least three points of spot welding, generally four points are better. Semi-welding should be applied during welding. The starting point should be about 1 cm better than the bottom point, so that the joint is good from the other side. If the wall thickness is thick, it should be layered, at least two layers, and after the first layer is completely welded, the second layer can be welded.


Seamless steel pipe plant adopts the latest seamless steel pipe implementation standard at the end of 2014


[1] GB/T8162-2008 "Structural Seamless Pipe" is a seamless steel pipe for general structural and mechanical structures.


[2] Seamless steel pipe for fluid transportation (GB/T8163-2008) is a universal seamless steel pipe that transports fluids such as water, oil and gas.


[3] Seamless steel tubes for medium and low pressure boilers (GB3087-2008) are high-quality carbon structural steels for the production of superheated steam pipes, boiling water pipes, superheated steam pipes and arch bricks for various medium and low pressure boilers. Hot rolled and cold drawn (rolled) seamless steel tubes.


[4] GB5310-2008 "High-pressure boiler seamless steel pipe" is a high-quality carbon steel, alloy steel and stainless steel heat-resistant steel seamless steel pipe, used for high-pressure and above water pipe boiler heating surface.


[5]GB6479-2000 "High-pressure seamless steel pipe for fertilizer equipment" is a high-quality carbon structural steel and alloy steel seamless steel pipe suitable for chemical equipment and pipelines, working temperature -40~400 °C, working pressure 10~ 30mA. .


[6] Seamless steel pipe for petroleum cracking (GB9948-2006) is a seamless steel pipe suitable for furnace tubes, heat exchangers and pipes of oil refineries.


[7] Steel pipe for geological drilling (YB235-70) is a steel pipe used by geological departments for geological drilling. According to the application, it can be divided into drill pipe, drill collar, core pipe, casing and sedimentation pipe.


[8] Seamless steel pipe for core drilling (GB3423-82) is a seamless steel pipe for drill pipe, core rod and casing for core drilling.


[9] Oil Drill 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 pipes, no wire pipe, the wire pipe is connected by joints, and the wireless pipe is welded by butt welding and tool joints.


[10] Marine carbon steel seamless steel pipe (GB5213-85) is a carbon steel seamless steel pipe for the manufacture of marine primary pressure piping systems, secondary pressure piping systems, boilers and superheaters. The working temperature of carbon steel seamless steel pipe wall does not exceed 450 °C, and the working temperature of 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 producing automobile semi-axle casing and drive axle half shaft.


[12] GB3093-2002 "Diesel high pressure oil pipe" is a cold drawn seamless steel pipe for the production of high pressure oil pipe of diesel fuel injection system.


[13] GB8713-88 "Pneumatic pneumatic cylinder precision inner diameter seamless steel pipe" is a cold drawn or cold rolled precision seamless steel pipe for the precision inner diameter of hydraulic pneumatic cylinder.


[14] GB3639-2000 "Cold-drawn or cold-rolled precision seamless steel pipe" is a cold-drawn or cold-rolled precision seamless steel pipe with high dimensional accuracy and good surface finish and hydraulic equipment. The use of precision seamless steel tubes to manufacture mechanical structures or hydraulic equipment can greatly shorten processing time, improve material utilization and improve product quality.


[15] Structural stainless steel seamless steel pipe (GB/T14975-2002) is a kind of hot-rolled stainless steel, widely used in chemical, petroleum, textile, medical, food, machinery and other industries of corrosion-resistant pipes and structural parts and parts. (extruded, expanded) and cold drawn (rolled) seamless steel tubes.