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Guideline values for setting values for aluminium and high-alloy steels

Since, in addition to sheet steel in all its variants (with and without coating), other metals are also very often […]

Guideline values for setting values for aluminium and high-alloy steels

Since, in addition to sheet steel in all its variants (with and without coating), other metals are also very often spot welded, here are the corresponding parameter suggestions. The values given are intended to be indicative only. In the specific case, of course, the corresponding factory standard or DVS specification applies. Under this condition, the following parameter recommendations are also to be understood as rough guide values. They are intended to give the user a point of reference and serve as a basis for further optimisation. When welding aluminium, a very high current of approx. I » 30 * Öh in kA is required – due to the good conductivity of the aluminium. Of course, the great differences within the various aluminium alloys should be noted.

The electrode force should be F » 2500 * h in newtons. Often a special printing programme is used. For the welding time, ts » 8 * h in periods (20 ms) shall be used. The minimum point diameter dL » 11 * Öh in mm is given as a guideline. Short welding times with high force are recommended for high-alloy stainless steels. Here, the rule of thumb is ts » 5 * h in periods (20 ms) for the welding time, F » 4000 * h in Newton for the welding force and I » 6.5 * Öh in kA for the welding current.

The recommended point diameter is in the range of unalloyed steel. As already written at the beginning, these are guideline values that have to be adjusted depending on the real situation. When using medium frequency technology, very good welding results can be achieved in short welding times, especially when welding aluminium, due to the more efficient energy input.

You can find further information on this in the DVS leaflets, the reference value tables of the machine manufacturers or, of course, from your Harms & Wende partner.

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