ANALYSIS OF THE CAUSES OF THE SPIRAL WELDED PIPE WELD APPEAR POROSITY

Spiral welded pipe density is one of the requirements when welding, so when using spiral welded pipe wouldn’t an accident. Spiral welded pipe manufacturing production when they meet certain conditions, such as porosity, when the manufacture of spiral welded pipe weld will appear porosity, like a spiral welded pipe in use when the word there is in the middle of the weld porosity, will affect the density of spiral welded pipe, the pipeline leaks cause significant losses. And the use of spiral welded pipe will because of weld porosity, and cause corrosion, reduce the use time of spiral welded pipe.

The most common cause of spiral welded pipe weld porosity of reason: the flux of water, or some dirty things, such as in the welding of these things when porosity makes the spiral welded pipe. During welding, choice of flux composition, when welding to reaction, thus hydrogen will not appear porosity during welding. During welding, the thickness of accumulation of flux should be between 25 to 45, and when to use it should be noted that particle degree of the flux, density is small in the accumulation of time should be take the maximum, if on the other hand, should take the minimum.

In the summer or the appropriate comparison of weather, can be recycled after the flux of drying, the drying after use. To prevent the occurrence of pores on the surface of the spiral welded pipe, should be on the surface of steel plate processing, when welding steel plate should be above all the dirty things, avoid when welding to other material into the spiral welded pipe in the pipe body, cause porosity.