Preheating to help Stick Welding

[bobwills]

Instead of like preheating larger pieces most just bevel the pieces and run multiple passes on the thick stuff.

[undercut]

Would it help with reducing warping? Need to weld up some thinner gauge square tubing where they need to be butted up to each other. I will tack on opposite sides so that the welds won't pull them away from straight but I'm a bit concerned about warping the metal when I put in the welds along the seams.