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Were radiators always cast iron?

Hey folks - I'm taking a closer look at leaking radiators in a 1921 home I recently purchased. The leaks aren't coming from the valve, but may be coming from a split or crack. I'm having a plumber look more closely for me Monday. Anyway, when I was looking today, i swear it looked like some of the bottoms of the tubing seams had been welded. I know that cast iron doesn't really weld. Did they make radiators from steel during this period? If not, maybe someone made some welds that didn't really work. Here are a few photos of radiators in my home:


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