A faster travel speed is required when welding aluminum due to its excellent thermal conductivity heating up the metal in front of the weld. T F
Aluminum does oxidize but very slowly so short exposure to air is not a problem. T F
Aluminum oxide causes porosity because it is porous and holds moisture and contaminants. T F
Aluminum and its alloys become stronger at very high temps so a bigger weld actually strengthens the heat affected zone (HAZ) – the bigger and hotter the better. T F
Porosity (weld bubbles) is caused by hydrogen trapped in the weld and usually comes from moisture or oil products. T F
Aluminum deforms easily so tack both ends of a long weld before welding. T F
The thermal expansion of aluminum alloys is twice that of steel so stress cracking is less of a problem with aluminum. T F
The proper filler material will help prevent stress cracks in aluminum. T F