High and low-pressure butt fusion. Worldpoly 3/10 High Pressure is a hydraulically operated butt-welding machine suitable for PE and PP pipes and fittings from 3" to lo" IPS. using both high and low pressure welding methods. Excellent Australian Engineered design and construction provides a premium machine for welding both on the worksite and in the factory. The use of high quality construction allows for lower weight without compromising strength and performance. while providing extra strength when welding out-of-round pipe.