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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Guide on materials for the oxy-acetylene welding of aluminium and its alloys, including welding sticks and powders.

Identifier  ExFiles\Box 117\1\  scan0076
Date  24th December 1935 guessed
  
Material for Oxy-acetylene Welding of Aluminium and its Alloys.

If one wishes when oxy-acetylene welding aluminium or its alloys to obtain welded joints which are perfectly sound it is essential to use appropriate welding metals, and welding fluxes. As a result of systematic tests welding strips and fluxes, given below, have been evolved for the principal alloys.

Welding Stick. Section. Ref:Colour. Use.
O Round. Plain. Peraluman.
49 (4 S1) Square. Plain. Anti-corodal without subsequent heat treatment.
12 Hexagon. Plain. Anti-corodal with subsequent heat treatment.
30 Hexagon. Yellow. Aluman.
34 Hexagon. Green. Peraluman.

Note added by Ev.{Ivan Evernden - coachwork} { For welding the aluminium we suggest that we use our normal welding stick and flux. For the Aluman we can use No.30 of which we have a supply. As we have no No.34 for Peraluman we suggest that you use a strip of the sheet as a welding stick. For Anticorodal without subsequent heat treatment we have a supply of No.49.

When welding pieces having been submitted to heat treatment and having increased strength, it is necessary to take into consideration the diminution of the strength at the weld resulting from the inevitable heating of the pieces, and the presence of the welded seam which has a cast structure. In the case of Aluman and Peraluman the loss of strength at the joint is reduced to a minimum. Pieces in Anticorodal welded with stick No.12 can be submitted to subsequent heat treatment by which they recover their characteristic strength prior to welding.

Welding Powder.

For welding aluminium and its alloys one should employ exclusively the welding powder 'Lumiweld' with great advantages.
  
  


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