All the screw in anchors I've seen (several dozen, 30 years ago) had a
continuous weld for the entire helix. I would say that a "tack weld +
short weld" is a unit that was mis-manufactured (i.e. shipped before the
final welds were done). As you say, if the weld were to fail it would
be a problem.
Quite possible. This was a few years ago, and across several models.
Maybe there was a single contractor that was messing up the welds, I had
seen it in galvanized, and painted versions. It fully turned me off of
the screws, in addition to not being easy for me to install.
Kurt
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