Sheet Metal Adhesive Bonding

One option is to mask the mating surfaces before coating preserving the metal surface.

Sheet metal adhesive bonding.

Follow the instructions on the packaging for amounts. These single part glues need moisture to set but are waterproof once cured. Ms polymer adhesive are ideal metal adhesives for thin sheets of metal such as truck panel bonding where the low shrinkage provides no read through you can t see where the adhesive is placed through the panel providing a good aesthetic finish. Nevertheless it s possible to achieve a successful bond to the metal or its surface coating depending on the bond strength you need.

Also the no contact inner areas were brush coated with eastwood s. Notice the heavy bead 1 4 inch of adhesive along the entire bare metal contact area for positive adhesion and rust protection. These are used extensively to bond metal hinges knobs and fixtures to glass doors. Super glues require about one drop per square inch of surface.

If coated before the adhesive is actually bonding to any coating rather than the steel itself which affects surface energy and how well the adhesive wets out. Steel surfaces are typically coated before or after bonding to prevent corrosion either with zinc galvanized steel or some type of paint. Many epoxy metal glues require mixing adhesive and hardener components then applying with a specialized tool. Metal substrates and adhesives have widely different coefficients of thermal expansion cte which during repeated heating and cooling can cause the bonded joint to weaken.

Technicians can save time by welding only where adhesive peel failure or ghost lines are a concern and achieve better results by bonding in areas where sheet metal can warp during the welding process. On a painted surface the adhesive is not bonding to the metal but instead to the paint coating. Structural adhesives an adhesive s heat resistance and chemical resistance are important considerations for metal bonding. You can even resistance spot weld directly through uncured adhesive for areas where a weld can add stability.

Pieces to be glued must fit closely as these glues are poor gap fillers.