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Der ganze Satz lautet:
The elongate weld joint **preferably** at least partially consumes the one or more friction plug weld joints of the temporary weld and, **more preferably**, entirely consumes each of the friction plug weld joints.
I'd say this is careless use of English, but DO PLEASE give us the whole sentence..."better" would have been a better word to use because one is better able to provide "Steigerungen". Such as "good, better, even better, better still, best of all"...inaro