What is the difference between erw and saw pipes

Longitudinal submerged arc welded LSAW steel pipes. Since ERW pipe deformation in the deformation process more fully,coupled subsequent sizing flat oval,elliptical vertical changes and necking, making ERW pipe residual stress becomes smaller. Physical testing showed that the same specifications, the same material ERW pipe after incision along the axis, the axial and transverse incisions smaller displacement than the spiral submerged arc welded pipe. SAW steel pipe allowed, and pipe welding performance and overall performance is inconsistent, welding place prone to stress corrosion cracking.

Experiments show that stress corrosion fatigue test ERW pipe spiral submerged arc welded pipe length than life. High Frequency Induction Welded Pipe. Electric Fusion Welded Pipes. Longitudinally Submerged Arc Welded Steel pipes.

Double Submerged Arc Welded steel pipe. J-ing, C-ing and O-ing pipes. It heats the two edges of the steel to the point where one edge can form a bond. At the same time, under the action of the combined pressure, the edges of the tube blank melt and squeeze together. There are a lot of pipes could be manufactured by ERW process. Here below we list for the most common standards in pipelines. High-frequency welding HFW is a solid resistance heat energy.

Through high-frequency current welding resistance, the heat generated in the contact objects, so the objected surface is heated to the plastic state, then with or without forging to achieve a combination of steels. The high-frequency current pass through the metal conductor will produce two peculiar effects, skin effect and proximity effect. And HFW process is to uses the skin effect to concentrated on the steel object surface, use proximity effects to control the position and the power of the high-frequency electric current flow path.

Acrow Props. Scaffolding Planks. Cuplock Scaffolding. Kwikstage Scaffolding. American Scaffolding. Ringlock System. Frame System. Scaffold Deck. Shoring Prop. Multi-function Scaffold. Frame Scaffolding. Ringlock Scaffolding.

Tube and Coupler System. T-Form Slab Formwork System. Aluminium Formwork. Plastic Formwork. Film Faced Plywood. Formwork Accessories. Aluminum Formwork Accessories. Rebar Connection System. Rebar Coupler. Thread Rolling. Threading Machine.