What are the reasons for uneven wall thickness of spiral seam submerged arc welded steel pipes
Date: 2023-12-29
What are the reasons for uneven wall thickness of spiral seam submerged arc welded steel pipes
The spiral seam submerged arc welded steel pipe has a uniform wall thickness, looks good, is evenly stressed, and is durable. The spiral seam submerged arc welded steel pipe has uneven wall thickness and uneven stress on the steel pipe. The thin parts of the steel pipe will easily break. The uneven wall thickness of the steel pipe is A phenomenon that easily occurs during the rolling adjustment process of steel pipes. The uneven wall thickness of steel pipes is mainly reflected in uneven spiral wall thickness, uneven linear wall thickness, and thicker or thinner wall thickness at the head and tail. The details are:
1: Uneven wall thickness at the head and tail
Causes: 1) The front end of the spiral seam submerged arc welded steel pipe blank is cut with an inclination and too large a bend, and the centering hole of the pipe blank is not correct, which can easily form a tapered steel pipe head with uneven wall thickness; 2) The elongation coefficient is too large when perforating, and the roller The rotation speed is too high and rolling is unstable; 3) Unstable steel throwing by the punching machine can easily cause uneven wall thickness at the end of the capillary tube.
2: Uneven spiral wall thickness
The causes are: 1) Uneven wall thickness caused by adjustments such as an incorrect rolling centerline of the piercing machine, unequal inclination angles of the two rollers, or too small front pressing amount, usually distributed in a spiral along the entire length of the tapered steel pipe; 2) Uneven wall thickness caused by premature opening of the centering roller, improper adjustment of the centering roller, and vibration of the ejector during the rolling process is usually distributed in a spiral along the entire length of the tapered steel pipe.
Post time: Dec-29-2023
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