Page 264 - Welding of Aluminium and its Alloys

Index

age hardening see precipitation hardening filler metals
alloy elements 35–36 effect on hot cracking 29–31
alloying interstitial and substitutional 14 selection 46–50
alloy metallurgy 40–46 fillet weld definitions 74, 75
heat treatable 43–46 friction welding
non-heat treatable 40–43 friction stir welding 161–165
aluminium capabilities 163, 164, 165
applications 7 mechanical properties 165
characteristics 4, Appendix B process principles 160–161
history 1 rotary motion 161
backing bars and strips 78–80 gamma radiography 213
butt welds definitions 75–78 GMAW see MIG
grain size 12–13
cold work (strain hardening) 15–16
effect on hot cracking 30
defects 199–205 GTAW see TIG
hot cracking 24–31
oxide filming 22–24 handling of parent metals 51
porosity 18–22
‘suck-back’ in TIG welding 111 laser cutting 58–63
degreasing 66–68 health and safety 60–63
mechanical cleaning 66 parameters 61
chemical cleaning (pickling) 67 principles 58–60
design laser welding
backing bars and strips 78–80 arc augmented 154–155
edge preparations (joint design) 72–78 CO 2 laser welding 152–153
edge preparations (joint design) for MIG defects 154
136–139 Nd-YAG (solid state) welding 153–154
edge preparations (joint design) for TIG process principles 150–152
98–99 liquation cracking see hot cracking
effect of position 72 mechanical cutting 64–66
for access 70–71 MIG welding
designations 36–40 arc starting 135
alloy composition identification 36–38 contact tip 129–130
temper designations 38–40 electro-gas welding 143–144
distortion 84–89
filler wire 133–134
electron beam welding fine wire 124
capabilities 157, 160 mechanised and robotic welding 141–143
process principles 155–157 parameters (argon shielding) 136–137
parameters (helium shielding) 138
fatigue 89–96 power sources 119–121
joint classification 92–94 process principles 116–118

235