Sheet Metal Adhesive Bonding

On a painted surface the adhesive is not bonding to the metal but instead to the paint coating.

Sheet metal adhesive bonding. Steel surfaces are typically coated before or after bonding to prevent corrosion either with zinc galvanized steel or some type of paint. 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. Many epoxy metal glues require mixing adhesive and hardener components then applying with a specialized tool. Polyurethane glues are very sticky adhesives that will bond metal to metal as well as to a long list of other materials.

3m panel bonding adhesive provides a continuous bond and seals weld and rivet bonded areas against corrosions the result of years of development and testing our 3m panel bonding adhesive bonds and seals plastic and metal substrates including cold roll steel aluminum smc and frp traditional fiberglass. 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. Notice the heavy bead 1 4 inch of adhesive along the entire bare metal contact area for positive adhesion and rust protection. Follow the instructions on the packaging for amounts.

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

These are used extensively to bond metal hinges knobs and fixtures to glass doors. Structural adhesives an adhesive s heat resistance and chemical resistance are important considerations for metal bonding. Nevertheless it s possible to achieve a successful bond to the metal or its surface coating depending on the bond strength you need. You can even resistance spot weld directly through uncured adhesive for areas where a weld can add stability.

Super glues require about one drop per square inch of surface.