Technical category guide

Wedge Welding

Wedge welding is a continuous thermoplastic joining process in which a heated wedge travels between overlapping material layers. Pressure applied immediately behind the wedge forms the welded seam.

Today, wedge welding is used throughout industrial production, roofing, geomembrane fabrication, nonwoven textile processing, field installations, repair, maintenance, and specialized thermoplastic fabrication.

Understand the methods Choose a Novaseal® wedge welder

Simplified BPR wedge-welding diagram showing a rotating pressure roller, overlapping material, heated wedge, and supporting base — Simplified BPR wedge-welding arrangement. The heated wedge travels between overlapping material layers while the pressure roller consolidates the seam against a supporting base.

Process fundamentals

How wedge welding works

During wedge welding, the material layers move relative to a heated wedge. The wedge transfers thermal energy directly to the surfaces being joined. Pressure is then applied while the heated surfaces are in contact.

Successful welding depends on the interaction between the equipment configuration, process settings, complete material composition, layer structure, and required seam performance.

Two pressure arrangements

Conventional wedge welding and the BPR method

Most of the industry is familiar with one conventional wedge-welding arrangement. BPR uses a different wedge-and-pressure relationship that permits additional machine forms and operating methods.

Conventional wedge welding

Most wedge-welding equipment uses the familiar arrangement in which the heated material layers pass between opposing pressure rollers immediately after the wedge.

Because this is the configuration most widely recognized throughout the industry, it is normally described simply as wedge welding or conventional wedge welding.

For technical comparison, the arrangement may be identified as an opposing pressure roller configuration. The abbreviation OPR is not required for normal buyer-facing discussion.

Base pressure roller wedge welding

Base pressure roller, or BPR, wedge welding uses a different relationship between the wedge, pressure roller, material, and supporting surface.

In its simplest complete configuration, the BPR method is implemented as a purpose-built handheld wedge welder. For integrated systems, the wedge and pressure arrangement are engineered directly into equipment designed around the application, material, workflow, and production requirements.

Read the detailed method comparison

Current use

Industrial production and field applications

Wedge welding is not limited to geosynthetic field work. Handheld, wheel-mounted, stationary, traveling, automated, and custom systems support a wide range of industrial processes.

Industrial production

Handheld BPR welding is often used as a primary production method, not merely for patching or repair.

Repetitive fabrication
Short and continuous seams
Roofing products and membranes
Production-line welding
Complex assemblies and limited-access areas

Integrated nonwoven textile systems

Integrated BPR wedge-welding systems such as the GT-200 are engineered specifically for compatible nonwoven textile materials. Wheel-mounted field equipment represents one application-specific configuration rather than the definition of the system.

Nonwoven fabrics
Geotextiles and related materials
Walk-behind field welding
Made-to-order machine configuration

Review GT-200 and field applications

Repair, finishing, and access

Suitable handheld BPR equipment can reach seams or sections that larger conventional machines cannot process.

Patchwork and repair
Tight-space welding
Short inaccessible sections
Finishing operations

Explore industrial and custom BPR applications

Material compatibility

Weldability depends on the complete material

Wedge welding is used with compatible thermoplastic films, coated fabrics, nonwovens, laminates, membranes, and other flexible material constructions.

Suitability cannot be determined from polymer name alone. Application testing may be necessary when materials are unfamiliar, multilayered, printed, coated, or intended for demanding production conditions.

Review materials and weldability

Coating or film chemistry Base fabric or reinforcement Thickness and layer count Surface treatment or printing Softening and melting behavior Temperature, speed, and pressure Required seam performance

BPR configurations

Purpose-built handheld and integrated wedge-welding systems

BPR is the sealing method. The wedge and pressure arrangement can be configured as a complete handheld device or engineered directly into a wheel-mounted, automated, or application-specific system.

Limited inventory

Novaseal® GT-100

BPR Handheld Wedge Welder

The GT-100 is the simplest complete configuration of the BPR sealing method. It is a purpose-built handheld wedge welder developed for production, fabrication, repair, maintenance, field work, and specialized industrial applications.

Availability: Manufactured with limited inventory; typical delivery is approximately 2–4 weeks, subject to current availability and production scheduling.

Made to order

Novaseal® GT-200

Integrated BPR Wedge-Welding System

The GT-200 is an application-specific integrated BPR wedge-welding system engineered for compatible nonwoven textile materials. The wheel-mounted field configuration is one example of the GT-200 concept rather than its defining characteristic.

Availability: Manufactured on a made-to-order basis.

Engineered to order

Custom BPR systems

Application-Specific Machinery and Automation

Nova Products Mfg., Inc. evaluates custom BPR wedge-welding systems for roofing, production-line welding, automation, specialized material handling, alternative wedge orientations, laser-guided seam tracking, split-wedge pressure-channel systems, custom machine packaging, and other unique applications.

In these systems, the wedge is configured directly as part of the required BPR machine architecture.

Availability: Engineered and manufactured to order according to application scope.

Use the wedge-welder selection guide

Process selection

Wedge welding compared with other methods

Wedge welding overlaps with several thermoplastic joining processes, but each uses a different energy-delivery and pressure arrangement. No single method is appropriate for every material or application.

Process selection may depend on material composition, seam geometry, production rate, accessibility, tooling, automation requirements, and required seam performance.

Wedge weldingContinuous heated-wedge process

Hot-air weldingHeated-air travel process

RF weldingRadio-frequency dielectric process

Impulse weldingSingle heating period followed by cooling

Packet Welding™Separate patented thermoplastic-welding platform technology

Compare thermoplastic welding processes

Manufacturer and support

Discuss a wedge-welding application

Novaseal® handheld and integrated wedge-welding systems are manufactured and supported by Nova Products Mfg., Inc. Manuals, parts, service, application evaluation, and custom BPR system development remain available.

Choose a Novaseal® wedge welder