---
title: "Hot-Plate vs IR Welding: The Epic Showdown"
description: Hot plate and IR welding both require heat and pressure but differ in application methods, material compatibility, and energy consumption. Discover their unique advantages and ideal applications.
---

[Extol Blog ](https://blog.extolinc.com)

# [Hot-Plate vs IR Welding: The Epic Showdown](https://blog.extolinc.com/hot-plate-vs-ir-welding-the-epic-showdown)

 Written by [Jason Dornbos](https://blog.extolinc.com/author/jason-dornbos) | Jun 30, 2025 11:00:00 AM

This webinar compares hot plate welding and IR welding, emphasizing that both technologies require heat and pressure, but differ in how heat is applied [[06:12](http://www.youtube.com/watch?v=y0TZRtB94F8&t=372)].

**Hot Plate Welding**

- **Process:** Involves touching plastic parts to a heated tool, allowing heat to conduct into the weld rib [[06:38](http://www.youtube.com/watch?v=y0TZRtB94F8&t=398)]. This method ensures weld surfaces are parallel, even if parts are warped, leading to strong, consistent joints [[11:36](http://www.youtube.com/watch?v=y0TZRtB94F8&t=696)].
- **Parameters:** Heat is controlled by tool temperature, melt depth, and time. Pressure (seal and weld phase) is controlled by depth, force applied, and hold time [[10:03](http://www.youtube.com/watch?v=y0TZRtB94F8&t=603)].
- **Materials:** Great for polypropylene, ABS, polycarbonate, and materials with fillers like glass or talc. Not recommended for sticky materials, such as nylon and PBT [[13:29](http://www.youtube.com/watch?v=y0TZRtB94F8&t=809)].
- **Advantages:** Creates strong, robust, and hermetic seals with no particulate generation, making it suitable for clean room environments [[24:36](http://www.youtube.com/watch?v=y0TZRtB94F8&t=1476)]. Can achieve 80-100% parent material strength [[23:13](http://www.youtube.com/watch?v=y0TZRtB94F8&t=1393)]. Effective for stack welding multiple layers [[31:28](http://www.youtube.com/watch?v=y0TZRtB94F8&t=1888)].
- **Applications:** Engine degas bottles, automotive interior trim (glove boxes, center consoles, armrests, etc), batteries, and medical blood cartridges [[21:12](http://www.youtube.com/watch?v=y0TZRtB94F8&t=1272)].
- **Equipment:** Extol offers the Rapid Conductor (three sizes for various working areas), Compact Fusion (smaller, benchtop unit), and custom large hot plate welders for big parts like pallets [[33:01](http://www.youtube.com/watch?v=y0TZRtB94F8&t=1981)]. A new, more cost-effective welding platform with multiple technology options is also being launched [[34:52](http://www.youtube.com/watch?v=y0TZRtB94F8&t=2092)].

### **IR Welding**

- **Process:** A non-contact process where an IR emitter radiates energy absorbed by the plastic part [[06:52](http://www.youtube.com/watch?v=y0TZRtB94F8&t=412)]. Heat and pressure phases are similar to hot plate welding, but heat is applied via radiation [[07:15](http://www.youtube.com/watch?v=y0TZRtB94F8&t=435)].
- **Types:** 
    - **InfraGuide:** Unique to Extol, uses individual bulbs for focused, efficient, and tunable energy. Air cooling minimizes flare-ups by pushing gases away from the emitter [[43:09](http://www.youtube.com/watch?v=y0TZRtB94F8&t=2589)]. Can weld clear polysulfone.
    - **Quartz IR:** Uses quartz emitters, which can be challenging to achieve uniform energy and may have a medium flare-up risk [[45:00](http://www.youtube.com/watch?v=y0TZRtB94F8&t=2700)].
- **Materials:** Suitable for materials that may be sticky for hot plate welding, such as nylons and PBTs [[48:25](http://www.youtube.com/watch?v=y0TZRtB94F8&t=2905)].
- **Advantages:** Non-contact process prevents sticking. InfraGuide allows fine-tuning power across the weld surface [[43:09](http://www.youtube.com/watch?v=y0TZRtB94F8&t=2589)]. Can be used for applications requiring airtight and particulate-free welds [[48:25](http://www.youtube.com/watch?v=y0TZRtB94F8&t=2905)].
- **Considerations:** Part size affects cost; InfraGuide can become costly for very large parts [[46:43](http://www.youtube.com/watch?v=y0TZRtB94F8&t=2803)]. Weld rib design needs to be different from hot plate welding, often requiring less height [[19:03](http://www.youtube.com/watch?v=y0TZRtB94F8&t=1143)].

### **Key Comparisons**

- **Material Compatibility:** Main consideration when choosing between the two [[07:49](http://www.youtube.com/watch?v=y0TZRtB94F8&t=469)].
- **Particulate:** Both hot plate welding and IR welding produce flash but no particulate [[24:36](http://www.youtube.com/watch?v=y0TZRtB94F8&t=1476)].
- **Warped Parts:** Hot plate welding excels at normalizing warped surfaces due to material displacement [[11:51](http://www.youtube.com/watch?v=y0TZRtB94F8&t=711)]. IR welding does not displace material, so initial part flatness is more crucial [[19:20](http://www.youtube.com/watch?v=y0TZRtB94F8&t=1160)].
- **Energy Consumption:** Hot plate welders, once on, remain stable but continue to consume energy. Designs are evolving to minimize thermal mass and reduce power [[29:35](http://www.youtube.com/watch?v=y0TZRtB94F8&t=1775)]. For very large parts, the energy consumption of IR welding can sometimes exceed that of a hot plate [[31:15](http://www.youtube.com/watch?v=y0TZRtB94F8&t=1875)].
- **Flexibility:** Hot plate welding offers geometrical freedoms for contoured parts that vibration welding might not [[22:27](http://www.youtube.com/watch?v=y0TZRtB94F8&t=1347)].

[View full post](https://blog.extolinc.com/hot-plate-vs-ir-welding-the-epic-showdown)

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