Hair­pin welding

e‑mobility

Join­ing of cop­per connections

The join­ing of cop­per con­nec­tions is a cen­tral man­u­fac­tur­ing process of the elec­tric motor. State-of-the-art elec­tric dri­ves are “wound” with rec­tan­gu­lar wires instead of round wires. Each of these 100 to 200 hair­pin pairs must reli­ably main­tain the elec­tri­cal con­duc­tiv­i­ty over the ser­vice life. If one con­nec­tion fails, the motor no longer works. There­fore, togeth­er with the Insti­tute for Laser Tools in Stuttgart and the Fraun­hofer Insti­tute for Laser Tech­nol­o­gy ILT in Aachen, using elab­o­rate test series we have ana­lyzed how and to what extent the 4D.watch­er can be used for auto­mat­ic mon­i­tor­ing dur­ing welding.

Expul­sions may be formed par­tic­u­lar­ly due to con­t­a­m­i­na­tions and paint deposits. In the case shown here, the expul­sion can no longer be detect­ed at the end of weld­ing, the seam is “OK” on the out­side. A look at the result of the com­put­er tomog­ra­phy shows that there a large imper­fec­tions as well as many small bub­bles inside. By using the 4D.watch­er, it is already vis­i­ble dur­ing weld­ing that the seam is obvi­ous­ly not OK. This way, time-con­sum­ing and cost­ly checks such as CT or grind­ing pat­terns can be saved.

In com­par­i­son

Our lega­cy prod­uct WELDWATCHER®

Our WELDWATCH­ER® is also an excel­lent solu­tion for mon­i­tor­ing dur­ing hair­pin weld­ing. These videos show that the process devi­a­tions which are the result of inner imper­fec­tions and bub­bles are reli­ably detect­ed by the mon­i­tor­ing system.

Sys­tem

TruD­isk 8001
PFO 33

Appli­ca­tion

P = 950 W @450 nm
P = 950 W @1070 nm
 
v = 100 mm/s

WELDWATCH­ER®

Ver­sion 5.343
AT sen­sor (sin­gle)

Coop­er­a­tion

Con­tact us!

If you would like to learn more about our prod­ucts and ser­vices, or would like to request a cus­tomized offer, please do not hes­i­tate to con­tact us. You can con­tact us by phone, via email or by using our con­tact form. We look for­ward to receiv­ing your enquiry!

Con­tact
Sched­ule con­sul­ta­tion appointment

Con­tact us!

If you would like to learn more about our prod­ucts and ser­vices, or would like to request a cus­tomized offer, please do not hes­i­tate to con­tact us. You can con­tact us by phone, via email or by using our con­tact form. We look for­ward to receiv­ing your enquiry!

Con­tact
Sched­ule con­sul­ta­tion appointment
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