Poka-Yoke
Poka-Yoke
(OP)
I am setting up a work cell to form a part in a 3 stage stamping die, then projection weld two nuts in location. I am interested in help with mistake-proofing the welding process. Does anyone have examples of methods used to make the welding failsafe?





RE: Poka-Yoke
RE: Poka-Yoke
If the weld is bad it may not fail until the component moves to assembly or final use. The normal approach is to carry out some form of press test, an alternative would be to monitor the parameters of the welding set during the operation and stop the process if these go out with set ranges. I haven’t seen this approach used for weld nuts but it does work for spot welding sheet metal components together.
RE: Poka-Yoke
2) Nut is displaced downward (due to melting of the interface area between nut and part).
You can use a current monitor for the first and an LVDT for the second. Then make them report back to the PLC - if they aren't happy with the weld, PLC declares a fault.
Steve
RE: Poka-Yoke