The recent introduction of the weldable core AVDEC™, L-40A, eliminates the need for special techniques when resistance welding. This permits the use of fixed schedule welders, in high volume manufacturing environments.

During the welding process weld additives in the core cause the core to heat and to be displaced from the weld zone. The weld initiation requires only 1 1/2 cycles of weld current. At the end of this cycle, the weld current will exceed 90% of the average current. By applying this understanding of AVDEC™'s behavior in the weld process, the appropriate weld schedule can be determined through experimentation.

Resistance spot, seam and mash seam welding have been proven feasible using L-40A.

Gas/flame welding is not recommended because of the heat required for the base material. Arc welding using CO₂, MIG and TIG can be used with certain limitations to minimize destruction of the core material.

A sound idea takes shape easily

Avdec™ damping material can take the place of other bulky, heavy (and costly) add-on noise controls. It is flexible enough for many products and can be stamped, drawn, formed, welded and fabricated -- often using existing tooling.

Drawability can approach that of single layer metal. Avdec™ sound-damped

composites have design properties equivalent to the properties of the two layers of metal, with the exception of stiffness or modulus of elasticity in bending.

Elastic bending modulus (stiffness) may be reduced since the stiffness to weight ratio of Avdec™ damping material is lower than single ply material. This difference relates to the damping loss factor . Changes in temperature, core material and core thickness affect this ratio. In most applications that consist of formed parts, the reduced stiffness is not a factor. Buckling strength requirements must be considered as the also are reduced.