The welding of aluminium and its alloys

Welding procedure and welder approval

10.1 Introduction

Very often the decisions on how a weld should be made, filler metal and welding parameter selection are left to the welder. While this may be acceptable in those situations where the weld quality is only incidental to the integrity of the fabrication it is not acceptable where the weld is crucial to the performance of the component. The need for approved welders to work to approved welding procedures is also often a requirement of either the application standard to which the fabrication is designed and con­structed or a contract specification requirement. Aside from these specifi­cation requirements it may be necessary for the fabricator to be able to demonstrate to clients, to regulatory authorities or, should a failure leading to loss or damage occur, to a court of law that the welds have been made to an acceptable quality. To specify how both the welds and the welders may be shown to be acceptable there are a number of standards available to the engineer. The requirements of some of these standards are covered in this chapter.

It cannot be emphasised too strongly that the detail below is only a summary of the specification requirements and must be treated with caution. Although best efforts have been made to ensure that the abstracts are accurate, they are only abstracts and accurate at the time of writing. Where compliance is a standard or contract requirement the latest edition of the approval standards must be consulted.

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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