The hot-melt butt joint of the crane pipe rotary joint should be checked according to the design requirements of the pipe, pipe fittings and pipe accessories before connecting, and the appearance quality inspection should be carried out at the construction site, and it should be used in accordance with the requirements of the national standard. In addition, what other regulations are there?
1. The connecting ends of the connecting parts at both ends should extend a certain free length from the welding machine fixture, and the two corresponding parts to be connected should be aligned so that they are on the same axis, and the wrong side should not be greater than 5% of the wall thickness of the crane tube rotary joint.
2. After heating, the connecting piece should be quickly separated from the heating tool. Check the uniformity of the melting of the heating surface of the connecting piece and whether there is damage.
3. Use uniform external force to make the connecting surface of the crane tube rotary joint completely contact, and flanging to form a flange, and the shape and size of the flange are uniform, without pores, bubbling and cracks.
4. There is a smooth and symmetrical outer flange along the circumference of the pipe section at the joint, and the lowest depth of the outer flange is not lower than the outer surface of the pipe section.
Remind everyone: Heat the fuser within the range of 220±5℃, and after the fuser indicator shows red, it is in the heat preservation state before welding the crane tube rotary joint.
