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| Weldbonding is a joining process that combines laser spot welding with adhesives. Weldbonding is applicable to aerospace, automotive, appliance, recreational, and other structural applications that require high tensile and shear strengths coupled with structural rigidity at lower weight, lower metal gauge, and low costs. Weldbonding offers several advantages over traditional riveting. Riveting requires spaced and aligned holes, which weldbonding does not. The holes and the rivets are stress concentrators, requiring thicker metal to deal with fatigue potential and also to provide the stiffness between rivets to transfer stress from one rivet to the next. With weldbonded structures, the adhesive carries the tensile and shear loads and spreads them evenly over the entire bonded area. A weldbonded structure provides hundreds of square inches of continuous bondline with strength values typically >2500 psi versus rivets providing only 300 psi strength spaced approximately every inch. The combination of discrete welds and a continuous adhesive interface provides a synergistic approach to structural joining by leveraging the contributions that each process element provides to the overall structure. Weldbonding offers greater structural rigidity at lower weight, and lower metal gauge at a lower cost. The photo below of a tailcone assembley shows the smooth surface obtained from weldbonding on the left side versus the riveted joint on the right side. EWI has developed enhanced weldbonding techniques using resistance welding methods, ultrasonic welding, and laser welding which improves weld quality and surface finish. This technology is available for nonexclusive license or purchase with or without technical assistance.Concerns fuel economy safety reliability performance continuously driving equipment designers engineers materials structures techniques aerospace automotive appliance recreational applications Weldbonding joining combines resistance spot-welding layer structural adhesive single joint receiving renewed attention drivers compared conventional Weld-bonded joints shown stronger either alone Furthermore presence increases stiffness fatigue spot-welded time-dependent temperature-dependent deterioration least partially mitigated spot-welds Lastly surfaces smoother less post-processing finishing weldbonded adhesively-bonded potential safer |
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