Hello i have an atypical acid steel exhaust, how can i weld it? I don’t want to damage anything and I have to somehow connect the two pieces of the pipe, thank you for your help 
Do you mean pickled steel? If so you either have to grind and clean or use the clamps like @Onyx_Z32 mentioned. I just used these same clamps on my truck with no leaks.
My VW had a similar clamp right from the factory. When it eventually failed I assumed the previous owner had hacked some repair but then I found out it was how the factory connected those two exhaust pipes. Figuring the first one lasted almost 100k in the salty NE I just slapped on another OEM one and forgot about it.
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Im currently at 125k on my GTI with the original still. I should replace it before next winter, b/c you know it will fail mid jan and i dont bring salty cars in the shop.
Dan