SOFT METAL???

12L14 can be welded, just not advisable due to lead toxicity
i have arc welded 12L14 to 1018 with E7018 (not that i would recommend the practice)

It is not un-weldable
it is inadvisiable to weld it unless you use a respirator.

Yeah, I assumed that was the reason it is called 'unweldable'... I haven't tried to weld it... yet...

-Bear
 
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