Chip breakers in your cutting tools help, in addition to your feeds and speeds. Long strings get messy and tend to pick up swarf as it goes... hands away!
Tech note on 12L14: It is perfectly weldable, but toxic. Weld temps are well beyond the vaporization point for lead, guaranteeing an easily-inhalable form of lead for your toxic metal freebasing pleasure. It's easier for manufacturers, suppliers, and their lawyers to call it a non-weldable product. Don't do it without a welder's PAPR respirator plus a welding fume evac system at minimum, and stick with low hydrogen filler alloys.