Butt-welding

Butt-welding

This jointing technique is suitable for d160-315 mm. The described process is according guideline DVS 2207 Part 11.

Butt-weldingButt-welding is a very economical and reliable jointing technique in which an additional tool is required to create the non-detachable joint. Butt-welding is very well-suited to the pre-fabrication of pipe elements and the construction of special fittings. In butt-welding, the welding surfaces (ends) of the components to be welded are first machined (planed). This produces coplanar ends that can later be simultaneously pressed against the heating element.
                                                                                                                                 Click on the illustration to see a larger version
Schematic representation of the butt-welding processThe welding surfaces are then heated by the heating element (hot plate) and lined up under slight pressure (alignment pressure). Subsequently, heating proceeds under reduced pressure (heating time) and, after removing the heating element (conversion), the joint is formed under welding pressure. The diagram at the right provides a schematic representation of the butt-welding process.













Heating temperature as s function of PP pipe wall thicknessAdjustable heating temperatures can be varied to
match wall thickness, see illustration at the right.













The process parameters can be established according this guideline. The calculated pressure needs to be loaded on the butt-weld components. Each butt-welding machine has specific internal friction and machine settings need to be adapted accordingly. The values given below are specific for the butt-weld machine Ritmo Delta Dragon. When another butt-weld machine (fabricator or type) is applied the welder needs to respect the
specific parameters of this fabricator/type.