EVER since the beginning of aircraft construction sheet metal fittings have been made by means of oxy‐acetylene welding; usually in the form of fittings connecting parts of plywood fuselages or of wooden wings. Later, strut fittings followed in which U‐shaped sheets or flanges were welded to tubes. Control‐gear parts were made from tubes, bushes and sheet webs. Afterwards, whole fuselages and control components, such as tail plane structures and elevators, became welded tubular structures. All attachments required for engines, undercarriages, wings and installed components were welded up, according to the design practice preferred.
Rethel, W. (1939), "The Design of Welded Components: Hints for Designers on Planning for Production", Aircraft Engineering and Aerospace Technology, Vol. 11 No. 11, pp. 425-427. https://doi.org/10.1108/eb030571
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