Spiral steel pipe welding seam treatment method

The spiral steel pipe feeds the strip into the welded pipe unit. After being rolled by multiple rollers, the strip is gradually rolled up to form a circular tube blank with open gaps. Adjust the reduction amount of the kneading roller to control the weld gap between 1~ 3mm, and make both ends of the welding joint flush. If the gap is too large, the nearby effect will be reduced, the eddy current heat will be insufficient, and the inter-crystal bonding of the weld will be poor, resulting in non-fusion or cracking.

If the gap is too small, the proximity effect will increase, and the welding heat will be too large, causing the weld to be burned; or the weld will form a deep pit after being kneaded and rolled, affecting the surface quality of the weld. Small and medium-sized steel, wire rods, steel bars, medium-diameter steel pipes, steel wires and steel wire ropes can be stored in a well-ventilated material shed, but they must be covered with a thatch.
Some small steel products, thin steel plates, steel strips, silicon steel sheets, small-diameter or thin-walled steel pipes, various cold-rolled and cold-drawn steel products, and high-priced and corrosive metal products can be stored in the warehouse. The site or warehouse where spiral steel pipe products are stored should be located in a clean and well-drained place, away from factories and mines that generate harmful gases or dust. Weeds and all debris should be eradicated on the site and the steel should be kept clean.
Large steel sections, rails, steel plates, large-diameter steel pipes, forgings, etc. can be accumulated in the open air. Materials that are corrosive to steel, such as acid, alkali, salt, cement, etc., must not be accumulated together in the warehouse. Different types of steel should be stacked separately to avoid confusion and contact corrosion. The warehouse should be selected according to the geographical conditions. Generally, a general closed warehouse is selected, that is, a warehouse with a roof, walls, tight doors and windows, and ventilation equipment.