The longer the zone of welding, which is responsible for the creation of a homogeneous compound, the higher reliability in harsh environments construction sites and long-term durability of the pipe connections. Recommended minimal length of the zone usually has a low tolerance of welding when welding on site.
The thickness of the walls of the PEX fitting must be chosen so as to withstand a pressure of PEX fitting the melt formed during the welding process. If the wall thickness is insufficient, the strength of parts will decrease, and it may increase in volume due to the effect of pressure welding. Sam figure “pressure welding” is not used for this in full. Available in the details of shrinkage stress, which should be used to create the weld pressure decreases and does not exert little effect on this parameter, if this voltage may still speak. As far as we know, his own tension inside the PEX over time is reduced – is relaxation. If you take into account the radial shrinkage to generate pressure at the joints, must be specified and the time of destruction “PEX fitting.
Open or closed heating coil – is it only a rhetorical question?
Two fundamentally different designs PEX fitting (Fig. 2, 3) have been proposed several decades ago, but controversy and debate about this do not calm down until now. Both options – helix, located in the thickness of PEX, and an open, visible in the lumen of the PEX fitting – repeatedly proven themselves over years of use.
