Re: Welding on Big box store bikes?
I've never owned a Cranbrook but as far as "big box bikes", if the Target Schwinn Jaguar qualifies, I can assure you that there is absolutely no problems with welding on it. In fact, I was impressed with the clean metal of the frame. I use TIG almost exclusively and TIG welding requires clean metal with no impurities for a good sound weld. I've not encountered any splatter that normally is associated with bad or dirty steel on my Jaguars. I think the bike shop guy you spoke to was full of it...and just wanted to see you buy an overpriced bike shop version of the same bike. If you're experienced with welding you'll have no problems.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"