Industrial plastic fabrication covers a wide range of processes. Some projects require simple cutting and machining, while others involve forming large thermoplastic sheet and welding multiple components into complete tanks, duct systems, liners, enclosures or process equipment.
What Is Plastic Fabrication?
Plastic fabrication is the manufacturing of finished products or components from plastic materials.
Fabrication operations can include:
- cutting
- sawing
- routing
- machining
- drilling
- forming
- bending
- plastic welding
- extrusion welding
- assembly
- finishing
The exact manufacturing process depends on the polymer, dimensions, part geometry and intended service.
What Is Thermoplastic Fabrication?
Thermoplastic fabrication is plastic fabrication involving materials that soften when heated and can be processed into useful shapes.
Many thermoplastics can also be joined by thermal welding methods.
Common fabrication materials include:
HDPE
High-density polyethylene for tanks, liners, containment, sheet assemblies and industrial components.
Polypropylene
PP sheet is widely used in tanks, ductwork, process equipment and industrial fabrication.
PVC
Rigid PVC is used in chemical process equipment, duct systems, enclosures and other fabricated products.
PVDF
PVDF is used in specialized chemical-resistant and high-purity fabrication applications.
ABS
ABS can be machined, formed and welded for compatible fabrication and repair applications.
PETG
PETG is used in formed and fabricated products where its particular properties are appropriate.
Plastic Welding in Fabrication
Plastic welding is an important joining method in thermoplastic fabrication.
Instead of relying entirely on mechanical fasteners or adhesives, compatible thermoplastic components can be joined by creating controlled fusion at the joint.
Common welding processes include:
- hot air welding
- hot gas welding
- speed welding
- extrusion welding
- hot wedge welding
- butt fusion
- socket fusion
See the Thermoplastic Welding Guide for a broader explanation of these processes.
Plastic Welding Rod for Fabrication
Many hot air and speed welding operations use plastic welding rod as filler material.
Common welding rod materials include:
- HDPE welding rod
- polyethylene welding rod
- polypropylene welding rod
- PVC welding rod
- PVDF welding rod
- ABS welding rod
- PETG welding rod
- TPU welding rod
HDPE Plastic Fabrication
HDPE is widely used in industrial plastic fabrication because it can be cut, machined, formed and welded using suitable procedures.
Common HDPE fabricated products can include:
- plastic tanks
- containment systems
- liners
- sheet assemblies
- hoppers
- industrial components
- custom fabricated products
HDPE fabrication may use hot air welding for detail work and extrusion welding for larger seams.
Learn more: HDPE Welding Rod and How to Weld HDPE.
Polyethylene Fabrication
Polyethylene is a broad polymer family that includes:
- LLDPE
- LDPE
- MDPE
- HDPE
- HMWPE
These materials are related but should not automatically be treated as identical.
Density, molecular characteristics, additives, pigments and the specific resin grade can affect fabrication and welding behavior.
See Polyethylene Welding Rod .
Polypropylene Plastic Fabrication
Polypropylene is another major thermoplastic fabrication material.
PP fabrication can be used for:
- chemical tanks
- process equipment
- duct systems
- scrubbers
- sheet assemblies
- industrial housings
- custom plastic products
Hot air welding, speed welding and extrusion welding can all be used in suitable polypropylene fabrication applications.
Learn more: Polypropylene Welding Rod and How to Weld Polypropylene .
PVC Plastic Fabrication
Rigid PVC is used in many industrial fabrication applications, including ductwork, process equipment, enclosures and chemical handling systems.
PVC sheet can be:
- cut
- machined
- formed using appropriate procedures
- joined mechanically
- joined using suitable adhesives in some applications
- welded using compatible PVC filler
Learn more: PVC Welding Rod and How to Weld PVC.
PVDF Plastic Fabrication
PVDF is used for specialized fabricated systems where the material's properties are appropriate for the service environment.
Applications can include:
- chemical process equipment
- high-purity systems
- specialty tanks
- ductwork
- piping components
- industrial assemblies
Material grade and welding procedures can be especially important in critical PVDF applications.
See PVDF Welding Rod.
ABS Plastic Fabrication
ABS can be cut, machined, formed and joined for compatible fabrication applications.
Hot air welding can be used where appropriate with compatible ABS filler material.
See ABS Welding Rod.
PETG Plastic Fabrication
PETG is used in various fabricated and formed products.
When welding PETG, the operator must control heat carefully to avoid unnecessary distortion or degradation.
See PETG Welding Rod.
TPU Fabrication
Certain thermoplastic polyurethane materials can be fabricated and thermally joined.
TPU materials can vary significantly in hardness and formulation, so the actual material should be identified before selecting welding rod or processing conditions.
See TPU Welding Rod.
Plastic Sheet Fabrication
Thermoplastic sheet is one of the primary starting materials for industrial plastic fabrication.
Sheet fabrication may involve:
- material selection
- layout
- cutting
- machining
- edge preparation
- forming
- fixture or assembly
- tack welding
- final welding
- inspection
The sequence varies according to the design and fabrication process.
Plastic Tank Fabrication
Thermoplastic tanks can be fabricated from sheet using welded joints and additional structural features appropriate to the design.
Common tank materials can include:
- HDPE
- polypropylene
- PVC
- PVDF
The correct material depends on:
- contained liquid or chemical
- concentration
- operating temperature
- tank dimensions
- mechanical loading
- environment
- service life requirements
- applicable standards
Plastic Tank Welding
Plastic tank fabrication can use both hot air welding and extrusion welding.
Hot Air Tank Welding
Hot air welding is useful for:
- tack welding
- smaller joints
- detailed areas
- repair work
- areas difficult to access with larger equipment
Extrusion Welding for Tanks
Extrusion welding can provide higher filler deposition for larger seams and heavier thermoplastic fabrication.
Successful extrusion welding requires appropriate:
- joint preparation
- parent material
- filler material
- surface preheat
- extrudate condition
- welding shoe
- travel speed
- pressure
Thermoplastic Duct Fabrication
Plastic duct systems are used where thermoplastic materials provide properties appropriate to the process environment.
Fabrication can involve:
- sheet cutting
- forming
- flange fabrication
- hot air welding
- extrusion welding
- reinforcement
- assembly
Material selection should account for the actual chemicals, temperatures, loads and service conditions.
Plastic Liner Fabrication
Thermoplastic liners and containment systems can be fabricated using sheet or membrane materials and suitable welding processes.
Depending on the system, joining methods can include:
- hot wedge welding
- extrusion welding
- hot air welding
- specialized membrane welding equipment
Custom Plastic Fabrication
Custom plastic fabrication can be used when a standard molded, machined or purchased component does not meet the application.
Custom fabrication can produce:
Tanks
Custom thermoplastic storage and process tank assemblies.
Ductwork
Fabricated thermoplastic duct systems and fittings.
Containment
Secondary containment, trays, liners and related systems.
Equipment
Custom housings, process components and industrial assemblies.
Sheet Assemblies
Fabricated panels, boxes, enclosures and welded sheet structures.
Repair
Repair of suitable thermoplastic components when material and service requirements allow.
Plastic Fabrication Tools
A thermoplastic fabrication shop may use:
- saws
- routers
- machining equipment
- drills
- forming equipment
- hot air plastic welders
- speed welding nozzles
- extrusion welders
- scrapers
- grooving tools
- fixtures
- measuring equipment
See the complete Plastic Welding Tools Guide .
Hot Air Welder for Plastic Fabrication
A purpose-built hot air plastic welder provides controlled heated airflow for thermoplastic welding.
Compared with a general-purpose heat gun, professional welding equipment is designed around the control and nozzle configurations needed for thermoplastic joining.
Speed Welding in Plastic Fabrication
A speed welding nozzle guides welding rod into the joint while heated air softens the parent material and filler.
Speed welding can improve consistency and productivity compared with freehand rod welding when the joint and application are appropriate.
Extrusion Welding in Plastic Fabrication
Extrusion welding is commonly used when larger seams require greater filler deposition than manual rod welding can efficiently provide.
Applications can include:
- tank fabrication
- large sheet assemblies
- liners
- containment systems
- heavy thermoplastic fabrication
Plastic Welding Rod Sizes for Fabrication
Common round welding rod sizes include:
| Rod Size | Approximate Inch Equivalent | Typical Use |
|---|---|---|
| 3 mm | 0.1181 in. | Smaller welds and suitable speed nozzles |
| 4 mm | 0.1575 in. | Common general thermoplastic fabrication |
| 5 mm | 0.1969 in. | Larger filler cross section |
| Triangle | Profile dependent | Fabrication and specialty welding applications |
| Custom | Customer specification | Special equipment, joints or OEM applications |
See Plastic Welding Rod Sizes .
Plastic Welding Temperature in Fabrication
The correct heat input depends on the material and process.
Variables include:
- polymer
- resin grade
- material thickness
- welding rod diameter
- airflow
- nozzle
- travel speed
- equipment
- ambient conditions
See the Plastic Welding Temperature Chart for hot-air-tool starting references and adjustment guidance.
Joint Preparation for Plastic Fabrication
A strong weld starts before heat is applied.
Joint preparation may include:
- cutting components accurately
- removing contamination
- scraping oxidized surfaces
- preparing bevels or V-grooves
- providing suitable root geometry
- aligning parts
- tack welding
- maintaining joint access
Why Plastic Fabrication Welds Fail
Weld failures can result from one or several factors.
| Problem | Possible Cause |
|---|---|
| Welding rod peels away | Insufficient fusion, contamination or incompatible filler |
| Weld cracks | Poor fusion, stress concentration, material condition or joint design |
| Plastic scorches | Excessive heat input or travel speed too slow |
| Rod does not soften properly | Insufficient heat or excessive travel speed |
| Uneven weld bead | Inconsistent rod feed, pressure, heat or travel speed |
| Extrusion weld peels | Insufficient preheat, contamination, poor preparation or incompatible filler |
See Plastic Welding Troubleshooting .
Plastic Repair vs. New Fabrication
Repairing an existing plastic component can be more complicated than new fabrication because the material may be:
- aged
- oxidized
- weathered
- chemically exposed
- stressed
- contaminated
- difficult to identify
A repair should address the cause of the original failure rather than only covering the visible crack with filler rod.
How to Identify Plastic Before Fabrication or Repair
Useful sources of material identification include:
- material markings
- manufacturer documentation
- sheet identification
- resin specification
- purchase records
- engineering drawings
Plastic Fabrication and Material Compatibility
A fundamental rule in thermoplastic welding is that the parent material and filler must be appropriately compatible.
Examples:
- HDPE generally requires compatible HDPE filler.
- PP generally requires compatible polypropylene filler.
- PVC requires filler appropriate to the PVC formulation.
- PVDF generally requires compatible PVDF filler.
- ABS generally requires compatible ABS filler.
Even within one polymer family, grade differences can matter.
Industrial Plastic Fabrication
Industrial plastic fabrication can support applications in:
- chemical processing
- water treatment
- manufacturing
- material handling
- ventilation
- containment
- equipment manufacturing
- tank fabrication
- maintenance and repair
Material and fabrication requirements should be based on the actual service conditions rather than simply choosing a plastic because it is easy to weld.
Plastic Fabrication Safety
Fabrication operations may involve cutting equipment, rotating machinery, hot tools, molten thermoplastic and potentially hazardous fumes.
Appropriate safety practices can include:
- machine guarding
- eye protection
- heat protection
- ventilation
- safe handling of hot welding equipment
- material-specific safety information
- confined-space procedures where applicable
- proper handling of tanks and chemical equipment
Plastic Welding Rod Manufacturer for Fabricators
New Image Plastics Manufacturing produces thermoplastic welding rod for professional plastic fabricators, distributors, OEMs and industrial customers.
Materials include:
- LLDPE
- LDPE
- MDPE
- HDPE
- HMWPE
- polypropylene
- rigid PVC
- flexible PVC
- PVDF
- PETG
- ABS
- TPU
- other suitable thermoplastic materials
See Plastic Welding Rod Manufacturer .
Custom Welding Rod for Plastic Fabrication
A fabrication project may require more than standard natural 3mm or 4mm welding rod.
Custom requirements can include:
- specific thermoplastic resin
- custom color
- custom diameter
- triangle profile
- specialty profile
- customer-specified material
- OEM packaging
- private labeling
See Custom Plastic Welding Rod .
Frequently Asked Questions
What is plastic fabrication?
Plastic fabrication is the process of converting plastic materials into finished components and assemblies using operations such as cutting, machining, forming, welding and assembly.
What is thermoplastic fabrication?
Thermoplastic fabrication involves plastics that can be softened by heat and processed into components. Many thermoplastics can also be joined using suitable welding processes.
What plastics are commonly fabricated?
Common industrial fabrication materials include HDPE, polyethylene, polypropylene, PVC, PVDF, ABS, PETG and other thermoplastics selected for the application.
Can HDPE be fabricated and welded?
Yes. HDPE is widely fabricated using cutting, machining, forming and welding processes.
Can polypropylene be fabricated and welded?
Yes. Polypropylene is widely used in welded tanks, ductwork, sheet assemblies and process equipment.
What welding rod should be used for plastic fabrication?
The welding rod should be compatible with the actual parent thermoplastic. For example, compatible HDPE filler is normally used for HDPE and compatible PP filler for polypropylene.
What size plastic welding rod is commonly used?
3mm, 4mm and 5mm round rod are common sizes. Triangle and custom profiles are also used.
What is the difference between hot air welding and extrusion welding?
Hot air welding usually softens the parent plastic and welding rod directly. Extrusion welding plasticizes filler material in an extrusion welder and deposits it into a preheated joint.
Can cracked plastic be repaired by welding?
Some thermoplastic components can be repaired by welding when the material is correctly identified, the damaged area is properly prepared and the repaired part can safely return to service.
Where can plastic fabricators buy welding rod?
Plastic welding rod is available from industrial suppliers, distributors and directly from manufacturers such as New Image Plastics Manufacturing.
Plastic Fabrication Resource Center
- Plastic Welding Guide
- Thermoplastic Welding
- Plastic Welding Rod
- Plastic Welding Rod Sizes
- Plastic Welding Temperature Chart
- How to Weld Plastic
- How to Weld HDPE
- How to Weld Polypropylene
- How to Weld PVC
- Hot Air Plastic Welding
- Extrusion Welding
- Plastic Welding Tools
- Plastic Welding Troubleshooting
- HDPE Welding Rod
- Polyethylene Welding Rod
- Polypropylene Welding Rod
- PVC Welding Rod
- PVDF Welding Rod
- ABS Welding Rod
- PETG Welding Rod
- TPU Welding Rod
- Plastic Welding Rod Manufacturer
- Custom Plastic Welding Rod
- Plastic Welding Rod Supplier
Plastic Welding Rod for Professional Fabrication
New Image Plastics Manufacturing produces thermoplastic welding rod for plastic fabricators, distributors, OEMs, equipment companies and industrial customers.
Materials include LLDPE, LDPE, MDPE, HDPE, HMWPE, polypropylene, rigid PVC, flexible PVC, PVDF, PETG, ABS and TPU.
Manufacturing capabilities include 3mm, 4mm and 5mm round welding rod, triangle rod, specialty profiles, custom colors, spool packaging, custom extrusion, OEM and private-label production.
New Image Plastics Manufacturing
Canal Fulton, Ohio, USA
Phone:
330-854-3010
Email:
newimageplastics@sbcglobal.net