In applying adhesive with welded pins, what is the recommended sequence?

• A. Apply adhesive first, then weld
• B. Weld first and then adhesive
• C. Use adhesive and weld separately
• D. Do not weld

Answer: (B)

Welding first and then applying adhesive is best because the heat of welding can alter or degrade any adhesive already in place, and it can distort the joint or cure the adhesive prematurely. By completing the welds first, you establish a solid, correctly shaped mechanical connection and can clean and prepare the surfaces without worrying about damaging adhesive. After cooling and surface prep, the adhesive is applied to finish the bond, fill gaps, and distribute load more evenly, giving better overall strength and durability.

If adhesive were applied first, the welding heat could weaken or burn it, and the welded pins might shift or misalign, reducing bond quality. Using both separately isn’t necessary once you’ve prepared the surfaces and coordinated the process, but the preserved sequence—weld first, then adhesive—provides the most reliable joint.