Plastic Material Factors That Affect Weldability - Trinetics Group

What are the material factors that affect ultrasonic welding?

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The factors that affect weldability of plastics are:

1) Lubricants

Lubricants such as mold release agents can inhibit the weldability of plastic parts. If mold release agents are used, parts should be cleaned prior to welding.

2) Impact Modifiers

Impact modifiers such as glass fibers can affect weldability of plastics. Because glass fibers melt differently than plastics, weld settings may need to be modified.

3) Foaming Agents

Foaming agents add air to plastic parts to reduce their density. These air pockets can affect weldability.

4) Colorants

The pigments in plastic colorants may have an affect on plastic welding requirements. While these can be minor, it is an important consideration if you are welding parts of the same geometry but different colors.

5) Resin Grade

There are many grades of resin for making plastic parts. Resins are designed to flow differently for injection molding, extrusion, blow molding, rotomolding, etc. The differences in flow rate can affect the part’s ability to weld.

6) Resin Age

Some resins change or breakdown over time. Attempting to weld parts of the same resin but different ages can have an effect on weldability.

7) Engineered Resins

In some cases, highly engineered resins may not lend themselves well to welding.

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