Answer: welded

AnswerCrossword Clue
WELDED

Seamless

WELDED

Used a torch

WELDED

Like many metal joints

WELDED
Fused, as metal
WELDED
Joined inseparably.
WELDEDUnited closely
WELDEDJoined
WELDEDUnited with a blowtorch
WELDEDJoined, permanently
WELDEDJoined together by heat
WELDEDWorked with metal
WELDEDJoined together
WELDEDJoined with a torch