Spiral steel pipe manufacturers steel pipe size and quality inspection

　　The cut steel pipe is inspected according to technical requirements. The inspection includes checking the size and bending of each pipe and the quality of the inner and outer surfaces of the pipe, and sampling the mechanics and process performance, but the inspection requires sampling. The inspection of the geometrical dimensions and bending of the steel pipe can be carried out on the inspection table, or it can be continuously detected by an automatic size detecting device such as laser caliper, thickness measurement, and length measuring instrument.
　　The inspection of the outer surface of the steel pipe is generally carried out by visual inspection, and the inspection of the inner surface can be checked by a reflective prism in addition to visual inspection. In general, modern steel pipe inspections use online eddy currents, on-line fluorescent magnetic powder and ultrasonic flaw detection methods, and special tube blanks such as oil wells for ultrasonic and magnetic flaw detection.
　　Products with unqualified surface quality should be ground, the outer surface should be grinded with a grinder, and the inner surface should be ground with an internal grinder. Some tubes with strict surface quality are surface treated by electropolishing. In order to increase the productivity of the rolling mill, continuous automation of inspection and grinding is urgently required to automate the production of steel pipes.
　　A. Preparation before inspection
　　(1) The inspector on duty should prepare the paint and high temperature chalk used for the inspection mark of this class for the application.
　　(2) Check whether the external surface illumination lamp and the inner surface inspection lamp are normal. If there is any problem, the steel pipe factory should be notified in time, and the electrician dispatching room of the steel pipe factory should be appointed to repair the electrician. The inner surface inspection lamp is not bright, and the human bank should not be inspected. The inspection light is not lit and the library is not checked.
　　(3) Check the caliper, wall thickness micrometer and other measuring tools. Whether the measuring tool is within the specified calibration validity period, whether the wall thickness micrometer and the vernier caliper zero can be aligned. If there is any abnormality, contact the person in charge of the measuring tool in the station and replace it in time. .
　　(4) The inspector should carefully check the work record, understand the main quality problems and remaining problems of the work; carefully check the production plan and process notice or the corresponding standards, and be careful in the variety, specifications and quality requirements of the steel pipes to be inspected by this class. There are a few.