Seldom is welding used to join polycarbonates because the degree of success has never been constant.
How to weld acrylic sheets.
To glue two pieces of acrylic together you must secure both sheets with a clamp or have an assistant hold them together so that they fit perfectly while you apply the solvent.
Lightly squeeze the applicator while pulling it toward you.
Put the acrylic on the edge where you want it and place the needle of the glue filled applicator where the two pieces meet.
If acrylic sheeting is being welded for box corner joints apply solvent on the inside edge of the acrylic sheeting.
It is also very economical and useful.
The cement will begin to dissolve the acrylic and form a strong bond immediately.
Capillary action will draw the glue into the joint.
Move the tip of the welding gun slowly over the plastic for a speed weld.
To weld two sheets of plexiglass we need to use plexiglass solvent.
Use masking tape on the glass to tape out the desired size and shape of the acrylic sheet.
However since this method is used this blog mentions it too.
To glue acrylic with solvent glue typically a squeeze bottle applicator with a needle tip is used.
Use clamps or masking tape to hold acrylic sheeting in place while applying solvent.
Use a needle nose application bottle to apply the acrylic cement to the acrylic sheets.
Apply the desired amount of acrylic fluid medium inside the tape using a one half to two inch soft artist brush.
Start at the top of the crack or area you wish to join.
Allow the coating to fully dry.
You can use a thinner to thin the mixture to create minimal brush marks.
Any of the two types of welding vibration welding and ultrasonic welding are used and the results depend on the shape and thickness of the sheets to be bonded.
Then heat the plastic until you see it beginning to melt.