Workshop butt welding machines

Building sites butt welding machines WIDOS are supplied with mechanical clamp shift (diameters up to DA 315 mm), or with hydraulic clamp shift (diameters up to DA 1600 mm).

These devices consists from basic construction, on which are clamping jaws mounted, heating element, planer and hydraulic aggregate (for devices with hydraulic clamping shift). Clamping jaws are available as a version for segmented angles and T-pieces (45°, 60° a 90°) manufacturing. Special welding devices for saddle-shaped T-pieces manufacturing, or double-jacket pipes, so-called "pre-insulated" pipes welding are also available. Can be supplied also with protocol unit (SPA), or control unit (CNC), alternatively with automatic controlled heating element.
Every device is designated for specific pipe dimensions, which is accomplished by using sets of reducer inserts attached into clamping jaws. For very special pipe dimensions or shapes (e.g. sheating or corrugated pipes) a custom-made reducer inserts can be supplied.

Butt welding principle

Butt welding (or pressure welding) is contact welding, it means, that welded surfaces are warmed by heating element. By pipe welding is used so-called "mirror", by plastic sheets welding is used so-called "heating lath".
Welded surfaces must be smoothly machined before welding - in case of plastic pipes the planer is used. Then an overlap is checked - by pipe welding can not be bigger than the 0,1 x wall thickness and welded surfaces must be cleaned up from grease and mechanical dirts. Next, under the exact set pressure (so-called "adjustable pressure") pipe endings are pushed on heating element, warmed at welding temperature. After the first phase pipe endings heating elapse (so-called "adjustment"), a beade appears on welded surface circumference. Now, the pressure must be minimalized and second phase of heating (so-called "in-depth heating") begin. After second phase is being elapsed the heating element must be removed from inbetween two welded pipes, and within the shortest possible time the heated pipe endings are put close to each other. This phase is called rearrangement. Subsequently, the pressure increasing phase is begin, where the pressure on welding pipe endings is gradually increasing up to the level of welding pressure. Under this pressure welded parts remains until the welding joint is fully cool down, in other words - during entire cooling phase.
For entire welding process, these three physical quantities are crucial: time, temperature and pressure. These quantities are exactly determined by technical standards depending on welding material type, wall thickness and pipe diameter.

Workshop butt welding machines range of products:

• WIDOS 2500 (DA 50 - 315) - device with mechanical clpm shift
• WIDOS 4001 (DA 90 - 315), 4002 (DA 90 - 315) - devices with hydraulic clamp shift, also available as version with SPA or CNC
• WIDOS 5000 (DA 160 - 500), 7000 (DA 200 - 630), 8000 (DA 500 - 1200), 12000 (DA 400 - 1200), 16000 (DA 800 - 1600) - devices with hydraulic clamp shift, also available as version with SPA or CNC
• WIDOS welding tables, surface up to 4 m2 - extreme sturdy welding devices with hydraulic clamp shift
• WIDOS ASM 160 (branching pipe DA 75 - 160), ASM 315 (branching pipe DA 63 - 250) - devices for butt welding of branching pipes and T-pieces