Basics
This is why aluminum is widely used in manufacturing.
What is lightweight, corrosion-resistant, and strong?
This is how quickly the oxide layer forms.
What is almost instantly?
This is why hydrogen is a major issue in aluminum welding.
What is it causes porosity?
This polarity is used to weld aluminum.
What is AC (alternating current)?
This must be removed before welding besides oxide.
What is oil/grease/contaminants?
This material has the greatest thermal conductivity.
What is aluminum?
This is the main benefit of the oxide coating.
What is corrosion resistance/protection?
This happens when hydrogen gets trapped in molten aluminum.
What is gas pockets/porosity in the weld?
This is why AC is used for aluminum welding.
What is it provides cleaning action and penetration?
This tool is commonly used to remove oxide.
What is a stainless steel wire brush?
This is how much greater aluminum’s thermal conductivity is compared to carbon steel.
What is about 3-5 times greater?
This is why oxide makes aluminum hard to weld.
What is it has a higher melting point than aluminum?
This is what happens if aluminum is welded without filler metal.
What is cracking or weak welds?
This is the purpose of DC+ in aluminum welding.
What is cleaning oxide off the surface?
This should be done immediately after cleaning aluminum.
What is weld right away?
This is what thermal conductivity refers to.
What is the ability of a material to transfer heat?
This happens if oxide is not removed before welding.
What is poor weld quality/contamination?
This is why you cannot use the lay wire technique on aluminum.
What is it oxidizes/does not properly fuse?
This is the purpose of DC- in aluminum welding.
What is penetration into the base metal?
This type of contamination leads to porosity in aluminum welds.
This type of contamination leads to porosity in aluminum welds.
This coating forms on aluminum when exposed to air.
What is aluminum oxide?
This is what you should do right before welding aluminum.
What is clean/remove oxide (wire brush or chemical clean)?
This is how you remove oil from aluminum before welding.
What is using a solvent like acetone?
This happens if you try to weld aluminum using only DC-.
What is oxide is not removed leading to poor welds?
This is the biggest challenge when welding aluminum overall.
What is controlling heat and contamination?