High-frequency welded scaffolding tube welding speed, welding heat affected zone is small, also don't need to clean up before welding, more convenient, so widely promoted.

High frequency welded scaffolding tube scratch is mainly caused by guide roller and the squeezing roller. Caused by high frequency welding squeezing roller scratch mainly occurs at the bottom of the steel scaffolding tube, the reason to roughly three, high-frequency house can for detail below.

Caused by high frequency welding groove is not consistent: steel scaffolding tube surface scratch, pass not match factors have squeezing roller bearing damage, squeezing roller to flee, extrusion roll pass is not the same size, two different height of squeezing roller position, squeezing roller bending and assembly is not stable, etc.

High frequency welding squeezing roller height mismatch: the lower edge of the extrusion of roll pass should be consistent with the height of the rolling line, and the height of the guide roller is determined by the steel tube wall thickness. If the guide roller is too low, squeeze the edge of the roll pass rounded corners will scratch on the bottom of the steel scaffolding tube.

On the squeezing roller extrusion: two roller structure of squeezing roller device, in particular, when insufficient on extrusion, under the effect of steel tube tension, the roller will appear on the elevation Angle, the groove is R rounded corners is outstanding, resulting in a scratch at the bottom of the tube. When extrusion roll pass R fillet after sharpening, will aggravate the scratch.