Straight seam pipe (ERW pipe) refers to a welded pipe whose weld seam is parallel to the longitudinal direction of the steel pipe. The straight seam pipe is made by rolling a long steel strip of a certain specification through a high frequency welding unit and welding it with a straight seam

(1) Check the drilling machine, grooving machine and pipe cutting machine to ensure safe use.(2) Preparation of materials and tools, including pipes, steel tapes, wrenches, vernier calipers, spirit levels, lubricants, wooden hammers, scaffolding, etc.(3) Install the support and hanger of the pipe to be installed according to the design requirements.

Phosphating is a process in which chemical and electrochemical reactions form a phosphate conversion film, and the formed phosphate conversion film is referred to as a phosphating film. It can play a great role in improving the rust resistance of steel pipes (such as seamless steel pipes or welded pipes). When we are phosphating steel pipes, we should pay attention to the following five points:

The appearance defects of the welded pipe include long knife bend, wavy bend, gnawing edge, scab, scratch, embossing, uneven head and tail, tower-shaped roll, loose roll, surface oxide skin, etc.

Rectangular tube is a name for square tube and rectangular tube (such as a500 square tube and a500 rectangular tube), that is, steel tubes with equal and unequal side lengths. It is made of strip steel after process treatment. Generally, the strip steel is unpacked, flattened, crimped, welded to form a round tube, and then rolled into a square tube from the round tube and then cut to the required length.

Steel pipes (such as seamless pipes and welded pipes) are easily rusted or even completely damaged in air, water or soil. Annual steel loss due to corrosion accounts for about 1/10 of the entire steel production. On the other hand, the surface of steel pipes and parts has certain special functions, and at the same time gives them a decorative appearance, so they are generally treated by galvanizing.