Extrusion welding is a process for welding composites and
thermoplastics. It was derived from hot gas welding, and it can either be done
manually or automatically using specially designed equipment, such as the plastic extrusion welder. The machine
makes it simpler to fabricate thick-section pipes and tanks, and it is
versatile for producing homogeneous, high-volume seams in one pass. Those
things may be impossible to do with traditional hot gas welding, requiring
multiple runs to create a single seam.
The plastic extrusion
welder comes in different sizes. It can be compact with a built-in
air supply, or large and heavy machines for more demanding applications, such
as welding lining material for landfills. You can get the machine in different
configurations, such as 110v and 240v. Historically, extrusion welding was used
mainly for joining HDPE and PP. Modern welders are now capable of welding PVDF
and PVC. For use on PVC, the extruder must be purged with a PE or PP weld rod
to avoid leaving the barrel’s degraded material.
Manufacturers have designed high-quality plastic
extrusion welder to make accurately define specific parameters,
which are likely to affect the quality of the weld. These parameters include
the quantity of the hot gas, the welding material’s hot flow rate and
temperature, and the hot gas temperature for substrate pre-heat. Welding speed
depends on the extrudate or welding material’s flow rate, thickness, the design
and size of the PTFE welding shoe, and the cross-sectional part of the seam.
For tank fabrication, the plastic
extrusion welder can be practical for welding tops and bases. In
some applications, it may be used to create the body panels, too. Where manual
welding techniques are necessary to fabricate large section pipes, extrusion
welding can replace them. In some cases, the device may be used for
environmental construction, particularly in joining a lining material for
building landfill waste sites, roof coverings, and lagoons. The welder is also
being utilized widely in water engineering and agriculture, like making
manways, land drainage systems, and sump tanks.
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