标签：preheating - 英国华人论坛

Pre - welding technology statusIn the early dsaw pipe production was not pre-welded until the second generation of UOE pipe unit began to show a pre-welder, but the moment of pre-welding for the joint welding, the distance of about 300mm, t...英国华人论坛

Preheat plastic pipe coating stage, preheat temperature control at 150 , after half an hour you can paint processing. Painting can be used when spraying or dip, high-voltage electrostatic spray painting is by way of the epoxy powder coated s...英国华人论坛