Let's remember that the 150 Amp welder is not doing 150 Amps at the
input where it is plugged in. The 150 Amps is the output at
considerably lower voltage.

Nominally the 50 Amp oven/stove connector/plug is perhaps drawing 20
amps about 8KW which is 4 burners on my stove. And the stove/oven load
is resistive. Not inductive as welders are.

Bob AZ