The welding of aluminium and its alloys

Welding speed

Aluminium is normally welded at higher travel speeds than when welding steels, particularly when using the MIG process. The implication of this is that abrupt changes of direction are to be avoided. It is, for example, impos­sible to weld around a 90° corner as the MIG torch cannot be moved rapidly enough to keep the correct lead angle. It is also difficult to weld around small diameter bosses fixed in position. In this sort of application the boss needs to be rotated with the torch held stationary. Such comments do not necessarily apply when fully mechanised or robotic equipment is used.

Automation or the use of robots enables torch positioning and motion to be controlled with the precision required for the production of quality welds.

The welding of aluminium and its alloys

Alloy designations: wrought products

Table A.4 BS EN BS EN Old BS/DTD Temperature (°C) numerical chemical number designation designation Liquidus Solidus IVIdUng range Al 99.99 1 660 660 0 AW-1080A Al 99.8 1A AW-1070A …

Principal alloy designations: cast products

Table A.3 BS EN numerical designation BS EN chemical designation Old BS number ANSI designation Temperature (°C) Liquidus Solidus Melting range Al 99.5 LM0 640 658 18 AC-46100 Al Si10Cu2Fe …

Physical, mechanical and chemical properties at 20°C

Table A.2 Property Aluminium Iron Nickel Copper Titanium Crystal structure FCC BCC FCC FCC HCP Density (gm/cm3) 2.7 7.85 8.9 8.93 4.5 Melting point (°C) 660 1536 1455 1083 1670 …

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