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C
hapter 6. Joint Preparation for Hot Wire GTA
Welding
P
reparation of the joint is a key to the success of automatic welding
procedures. The advantages of hot wire technology can best be realized in
downhand welding where the highest deposition rate can be achieved. This
would most likely be either a flat surface such as for cladding operations or
joining of circumferential joints in the 1G welding position in which the
weldment is rotated and the electrode remains stationary.
Joint preparations are considerably more critical for automatic welding
applications than for manual applications. Since welding equipment does not
sense or react to changes in the preparation, the preparation and fit-up must
be precise in order to realize the repeatability and consistency expected of
automatic machine or orbital welding. The use of machining tools designed for
precision joint preparation is strongly recommended. It should be understood
that weld programs are very prep-sensitive which means that even small
changes in preparation geometry can have major effects on weld quality.
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