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VYCOM Notch Welding This welding process uses two heating elements that simultaneously heat up the HDPE material surfaces. Using a heating element, a narrow groove is melted into the sheet material. The groove corresponds to the profile of the cross piece it is being welded to. The process requires good heat distribution. Once the material has softened, the heated cross piece is pressed into the melted groove, so that the two parts weld together. Bend Welding This welding process applies a method of heating material with a v-shaped element, when an HDPE sheet is to be bent or folded, normally to an angle of 90° degrees. To bend weld HDPE, material is heated to 390°F (+/- 50°F). Penetration into the material determines the bend angle (ex. 65% - 75% material penetration = 90° bend). Once the heating element has evenly penetrated to the desired percentage, the material can be bent to desired angle. It is common practice to choose a bending angle that is slightly smaller than required. During cooling, the angle widens due to material shrinkage. Extrusion Welding Extrusion welding is an alternative method to hot gas welding, commonly used in the manufacture of thick gauge HDPE material where large volume seams are necessary. Extrusion welding can be performed with an extrusion welding gun and welding rod or granular feed, depending on welding gun. Welding speed is dependent on the flow rate of the extruder, the material thickness, the cross sectional area of the seam, and the size of the welding shoe. The angle of the extruder and pre-heat of the substrate are extremely important. www.vycomplastics.com 16PDF Image | FABRICATION MANUAL HDPE
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