| EWS (electromagnetic resistance welding) is a method developed by KVT Bielefeld for interconnecting metal and thermoplastic parts. The threaded insert is heated without contact through an electromagnetic field, thus plasticizing the contact area of the plastic part. The molten material is displaced into any size are heated within a very short space of time (approx. 2 – 6 seconds). Since the melt cools rapidly as soon as the energy is switched off, parts can be fitted with an accuracy of up to 0.05 mm.
Suitable Böllhoff threaded inserts: HITSERT® 2, HITSERT® 3 and SONICSERT® |
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Insertion tools
| Equipment types | Range of sizes | Economic batch size |
| Hand-operated EWS gun | M1.4 - M8 | up to 5.000 |
| Lever-type hand-operated EWS thermofitting tool | M1.4 - M12 | up to 20.000 |
| Pneumatic EWS thermofitting machine | M1.4 - M40 | over 50.000 |
EWS thermofitting unit
with automatic fitting head Type AEK II | M3 - M8 | 300.000 |
| EWS thermofitting components | M2 - M8 | |
| Automatic thermofitting head Type AEK II | M2 - M8 | 100.000 |
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| Dimensions: | M1.4 - M40 |
| Insertion time: | M5 approx. 3 seconds |
| Special features: |  Low tension
 Multiple insertion possible
 Specially for inserts < M2 and for inserts with sealing ring
 Tolerance up to 0.05 mm
 Choice between one and two-phase process |
| Materials: |  Thermoplastics
 Thermoplastic elastomers |
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