How Does Fabric Welding Work and What Are the Benefits?
Published 22nd June 2026
Here at Redwood, we often refer to welded fabrics as part of our medical mattress manufacturing processes. But what exactly is fabric welding? How does fabric welding work? And what are the benefits of welding fabrics, compared to our traditional stitching methods?
In this article, we’ll explain the two different methods that Redwood uses for fabric welding and how each one works. We’ll also outline the many benefits that come with welded fabrics, for both specialist medical clients and domestic and contract bedding companies. These include infection control, ease of cleaning, faster/more cost effective manufacturing and consistent product quality.
What is fabric welding?
Fabric welding is a method of connecting two pieces of fabric without the need for adhesives or traditional stitching. Fabric welding works as follows:
-
The two fabrics are placed edge to edge or overlapped
-
Energy is applied to the seam
-
This energy melts the fabric coating or the fabric fibres
-
Pressure is applied to the molten surfaces forcing them to combine
-
The fabric is cooled and a permanent bond is formed.
Fabric welding is only suitable for fabrics made with synthetic fibres or coated fabrics. It cannot be used with natural fabrics, such as cotton or wool blends, as these do not melt in the same way when energy is applied.
How are fabric welds created?
Redwood uses two main methods of fabric welding. The right solution depends on the material being welded and the product being made.
-
Ultrasonic Welding – this method uses vibrations from focussed sound waves, at around 20 - 40K)Hz, to create friction. This friction heats the molecules of the two pieces of fabric and fuses them together. This method is suitable for small, delicate work, such as PPE and patient transfer equipment.
-
Radio Frequency Welding – this uses a much higher frequency of electromagnetic energy to melt the fabrics, at around 27MHz (around 100times higher than Ultrasonic welding. This is a similar process to microwave cooking and heats the fabric from the inside out (although microwaves use a much higher frequency, around 2.45GHz. This method is suitable for larger seams, such as medical mattresses.
What are the benefits of fabric welding?
Fabric welding has a number of benefits for all products, but it is of particular benefit in medical environments, such as hospitals, clinics and care homes.
General benefits of fabric welding
Fabric welding has many benefits that apply to all uses, including:
-
A premium product appearance with smoother, flatter, less bulky seams
-
Consistent, uniform quality across multiple items
-
Manufacturing efficiency leading to faster, more cost-effective production
-
No build-up of allergens in stitch holes and threads
Welded seams can deliver additional benefits for contract bedding users, such as prisons and hostels, where vandalism and damage to traditional stitched seams could be an issue.
Medical benefits of fabric welding
When it comes to medical applications, fabric welding offers far superior levels of hygiene and infection control.
-
Welded seams resist ingress of bodily fluids preventing staining, odours and microbial growth
-
Water-resistant mattress covers promote ease of cleaning and fast, effective disinfection
-
Smoother seams offer fewer less places to harbour bacteria and other pathogens and also enhance patient comfort
-
Consistent production creates better conformity of fitted covers, further reducing build-up of dirt, allergens and pathogens
Healthcare-Associated Infections (HCAIs) are a significant challenge for all areas of the healthcare system, both NHS and private. According to NICE, HCAIs cost the NHS £2.7 billion every year and are responsible for an estimated 22,800 excess deaths.
Fabric welding provides a frontline defence against infection by creating products that are less prone to infection risks, and which can be effectively and hygienically cleaned.
Discover a World of Fabric Welding Options Today
Whether you’re an established product buyer looking for a new fabric welding source or you want to find out more about how Redwood fabric welding services could benefit your products and end users, get in touch with the expert team at Redwood today.
With the very latest technical textiles, backed by innovative manufacturing techniques, Redwood is ready to meet your challenge. So, put us to the test today.
Frequently Asked Questions about Fabric Welding
Fabrics can only be welded if they have thermoplastic fibres or a thermoplastic coating. This includes Polyurethane (PU), Polyvinyl Chloride (PVC) and thermoplastic elastomers (TPE). Natural fabrics, like cotton, cannot be welded without adding a synthetic coating.
Yes. Stitching creates tiny weak points where the needle punctures the fabric. It is also limited by the strength of the thread. Welded seams are bonded at a molecular level, and welding often creates seams that are stronger than the fabric itself.
Welded seams create a watertight seal that prevents moisture ingress and will not harbour pathogens in the way that thread and stitch holes can. This makes welded seams much safer and more hygienic than stitched seams and also allows for easier cleaning.
Ultrasonic welding uses high frequency sound waves, at around 20-40 kilohertz to heat the fabric molecules. RF welding uses a much higher frequency electromagnetic waves, at around 27 megahertz, similar to a microwave oven.
