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Why can't steel and aluminum be welded together?

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Coat the steel prior to welding. Another method many use to successfully weld aluminum to steel is dip coating, also commonly referred to as hot dip aluminizing. This simply means that prior to welding the steel and aluminum together, the steel is first coated in aluminum. read more

Stainless steel cooking pans with aluminum heat spreaders on their bottoms have been around for years, 50-60-70 I'm not sure. Cookingware made of stainless steel sandwiching aluminum are welded together through extraordinary high pressure rollers physically squeezing their disparate atoms into a molecular bond. read more

A: It’s our understanding that the two metals can be bonded using some special techniques that you won’t find at the hardware store, but the two metals cannot be welded using standard methods due in large part to their different melting points. read more

That is why they cannot be welded together. I have had great success gluing alloy angle to stainless sheet - big contact area and sikaflex 291 means almost impossible to break joint. But sorry there is no practical way to join the metals by fusion, only mechanical ways like bolting, rivets etc. read more

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