Transverse crack this is relatively easy to understand, is through the wall for rigid waterproof casing surface occurred in the transverse crack, generally in the ingot period will occur in the transverse crack phenomenon, but most of them are shallow depth. Through the wall for rigid waterproof casing in the upper part or corners which may appear longitudinal cracks, then in the lower area will sometimes also appear shell skin makeup or tumor makeup of metal sputtering sticky, looks like a layer of scarring.
Through the wall for rigid waterproofing casing tube welded from steel plate, weld cracking is generally too deep at the weld grinding, so that the weld is too thin in the process of processing caused by the cracking phenomenon, belongs to the quality problem, which is not qualified through the wall for rigid waterproofing casing welded pipe, if not used is not found this problem, is generally used only after the discovery of this problem, so to our life is also brought A little trouble.
