Seamless tubes are widely used in our lives, and there are more and more types of materials on the market. Now everyone trusts
galvanized seamless steel tubes. Galvanized steel tubes are seamless steel tubes with better corrosion resistance. Yes, it is welcomed by many consumers. Next, we will introduce to you how to connect galvanized seamless tubes.
There are three main connection methods when connecting galvanized seamless tubes, namely wire type, welding type and rolling groove type.
1. Wired connection
(1) Random buckle: The tube hoop and the threaded buckle cannot be completely contacted and loosened.
(2) The threaded thread of the steel tube does not match the threaded thread of the pipe hoop and cannot be connected. The pipe hoop should be replaced or the equipment should be re-threaded.
(3) Leakage after steel tube threading: measure whether the wall thickness of the steel tube can meet the standard thickness requirements of the threaded pipe.
2. Welded connection
(1) There is a problem that the seamless tube mouth is not in a straight line and the steel pipe has a bevel after butt jointing. It is recommended to cut off a small section of the steel tube head before processing.
(2) After the seamless tube nozzles are docked, the two nozzles are not tightly connected, resulting in uneven thickness of the weld; and the steel tube is oval due to its own reasons or transportation bumps. It is recommended to cut off a small section of the steel tube head then process it.
(3) After the pipe nozzles are butted, trachoma appears at the nozzle part: 1. It is caused by technical reasons during welding; 2. There are zinc tumors at the pipe nozzle, which causes welding difficulties and trachoma problems. Simple inspection of excessive zinc tumors and excessive pipes zinc tumor removal treatment.
3. Roll groove connection
A. Roll groove weld cracking:
1. Grind the welding ribs on the inner wall of the grooved part of the nozzle to reduce the resistance of the rolling groove.
2. Adjust the axis of steel tube and rolling groove equipment, and require the level of steel tube and rolling groove equipment.
3. Adjust the speed of the grooving, the forming time of the grooving should not exceed the specified time, and the force should be applied evenly and slowly.
B. Roll groove steel pipe fracture:
1. Grind the welding ribs on the inner wall of the steel pipe nozzle pressure groove to reduce the resistance of the rolling groove.
2. Adjust the axis of the steel pipe and the rolling groove equipment to require the level of the steel tube and the rolling groove equipment.
3. Adjust the speed of the groove, the speed of the groove cannot exceed the specified, and the force is applied evenly and slowly.
4. Check the width and type of the support roller and pressure roller of the grooving equipment, and check whether there is any bite phenomenon caused by the size mismatch between the two rollers.
5. Use a vernier caliper to check whether the groove of the steel pipe is specified.
C. The groove formed by the rolling groove machine should meet the following requirements:
1. The surface from the pipe end to the groove section should be smooth without unevenness and rolling marks.
2. The center of the groove should be concentric with the pipe wall, the width and depth of the groove should meet the requirements, and check whether the type of the clamp is correct.
3. Apply lubricant to the rubber sealing ring and check whether the rubber sealing ring is damaged. The lubricant must not be oil lubricant.
