After lurking in the shadows for some time now and using the search bar to gain knowledge rather than pester you all with the same questions, I've decided my first post will have to be just that, pestering you all for help with regards to MSA, so here it goes...
I work in the automotive industry supply chain and have been tasked with conducting an MSA study (Gage R&R) on the process of measuring spot weld nugget sizes using the external faces of a vernier caliper.
My first question is,
Considering I have previously conducted studies relating to the use of external faces of a caliper (eg: plug gages) would a study on weld nugget sizes need to be carried out? Should there be an MSA study for every in-house measurement process we use a caliper for, or should the focus be on the caliper and every function of it that we use rather than each individual process?
We use alternative methods like Ultrasonic non destructive testing to confirm spot weld integrity and size. The focus on MSA and nugget sizes has came from above due to certain spot welds being classed as "Important A" characteristics.
My second issue is,
I can create samples using the same spot weld, off process, and have the actual nugget sizes confirmed to create a nominal value for each sample. I am aware there is a standard calculation for average spot weld sizes relating to material thickness and also a minimum standard for nugget sizes expected after a teardown but as far as I am aware, there isn't a tolerance that we work to that we can apply to the measurement results. (eg, nugget size = 6mm dia / ±1.0)
If anyone has been successful with a similar study, knows how to set this up or has any input / information at all, it would be greatly appreciated.
Thanks for your time.
Paul.
I work in the automotive industry supply chain and have been tasked with conducting an MSA study (Gage R&R) on the process of measuring spot weld nugget sizes using the external faces of a vernier caliper.
My first question is,
Considering I have previously conducted studies relating to the use of external faces of a caliper (eg: plug gages) would a study on weld nugget sizes need to be carried out? Should there be an MSA study for every in-house measurement process we use a caliper for, or should the focus be on the caliper and every function of it that we use rather than each individual process?
We use alternative methods like Ultrasonic non destructive testing to confirm spot weld integrity and size. The focus on MSA and nugget sizes has came from above due to certain spot welds being classed as "Important A" characteristics.
My second issue is,
I can create samples using the same spot weld, off process, and have the actual nugget sizes confirmed to create a nominal value for each sample. I am aware there is a standard calculation for average spot weld sizes relating to material thickness and also a minimum standard for nugget sizes expected after a teardown but as far as I am aware, there isn't a tolerance that we work to that we can apply to the measurement results. (eg, nugget size = 6mm dia / ±1.0)
If anyone has been successful with a similar study, knows how to set this up or has any input / information at all, it would be greatly appreciated.
Thanks for your time.
Paul.