What Is Hot Wedge Welding?

Hot wedge welding is a process used to achieve strong watertight and airtight seals for a variety of materials. Thanks to the nature of the joining, the resulting bond has a strength equivalent to that of the base materials, if not greater. This is why hot wedge welding is a popular choice for durable sealing of different types of plastics, synthetics, nylons and other coated materials. Here at MarkPeri, we are experts in a variety of welding processes and can guide you in your choice of method and materials for all your welding jobs.

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What Is an Industrial Hot Wedge Welder?

Do you have materials you’re looking to join and aren’t sure of the best process? A hot wedge welder might be the solution you’re looking for. An industrial hot wedge welder uses a heated rotary press to partially melt thermoplastic coatings on your materials before further heating them with a hot wedge. The additional heat from the wedge fully melts the coating, and pressure from the press creates a solid seal when the materials are cooled. Your hot wedge welded joints resist tearing and cracking and provide a reliable hermetic seal for liquids and air.

The Best Materials for Hot Wedge Sealing

Unlike many forms of joining two materials, hot wedge welding applies to a wide range of material types and thicknesses. A typical hot wedge seam varies from ¼ to 1 inch thick — related to the width of the rollers. The coated materials that work best with hot wedge sealing include:

  • Polypropylene
  • Polyethylene
  • PVC coated fabrics
  • Synthetics
  • Olefin
  • Nylon
  • Thermoplastic films

If you’re not sure if your materials can be joined using an industrial hot wedge welding process, let our team here at MarkPeri know. We can help you determine if hot wedge welding works for you or if one of our other welding processes — such as radio frequency welding — is the best option for your joining application.

With hot wedge welding, you can join any two materials of the same nature or two different coated materials, as long as they are of the same thickness. That means you can create a wide range of products, such as:

  • Air and liquid tanks
  • Fuel storage bags
  • Inflatable devices and equipment
  • Pneumatic pillows
  • Water storage tanks and bags

Hot wedge welding is a popular welding option for coated plastics and synthetic materials when you need airtight and watertight seals that are both strong and durable. Let us know about your joining needs and we’ll offer you the sealing solution that meets your requirements for a reliable hermetic seal.


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