About ERW (Electric Resistance Welded) Steel Pipes and Tubes:
The idea of ERW (Electric Resistance Welded) Steel Pipes and Tubes was born in 1920 however, the actual process of galvanization took place in 1962.
Making:
ERW (Electric Resistance Welded) Pipes and Tubes are made from strips of hot-steel. The steel is first flatted and placed into furnace allowing to pass through the welding electrodes. Further the electrodes which are copper disk type are connected with the secondary revolving transformer assembly which helps to contact on each side of the seam and temperature are raised to the welding point. The outside flash is removed as the tube leaves the electrodes and the inside flash is wiped out by an air hammer after the tube has been cooled. This formation is known as Electric Resistance Welded or ERW Tube / Pipe.
Sizes and Shapes:
It is available in different sizes and shapes to cater customer requirements. Generally, ERW Steel Tube is available in the range from 2 3/8 inch to 24 inch outer diameter in a variety of lengths up to 100 feet. ERW pipe is cheaper and stronger than seamless steel pipes. It is best suited for line pipes.
Qualities:
Before reaching the market place, ERW steel tubes and pipes are processed through several tests including ultrasonic weld inspection, hydro-test, bevel check, micrometer check, ring gouge and straightness evaluation to ensure its quality.
Usage :
ERW steel tubes are used in numerous heavy industrial applications like – fencing, scaffolding, line pipes, engineering purposes, oil industry, industrial construction, agricultural industry and the housing industry.