Stick Welding

Stick welding, or Shielded Metal Arc Welding (SMAW), is a manual arc-welding process using a flux-coated consumable electrode. The arc melts the base metal; the electrode deposits filler metal while flux creates shielding gas and slag to protect the weld. It suits structural frames, machine bases, and outdoor repair on thicker steel where portability and fit-up tolerance matter.

In a CNC cell or fabrication area, stick welding often appears when a machine frame, fixture, or gantry needs reinforcement and the part is too large, dirty, or awkward for cleaner processes. Angle-iron gussets get welded onto frames to stiffen connections near linear rails. Because SMAW is portable and less sensitive to mill scale, rust, and imperfect fit-up, it is practical for maintenance, repair, and structural tacking. Operators balance amperage, electrode angle, travel speed, and arc length to control penetration and bead profile. Electrode selection drives quality: 7018 low-hydrogen rods are standard for structural welds and should be run electrode-positive with adequate amperage. Slag from the flux must be chipped and brushed after every pass, especially in multipass fillets, since trapped slag creates lack of fusion and hidden defects that matter in machine supports.

• ⚠️Undercut from poor technique or excessive heat: Fast travel speed, long arc, or wrong rod angle gouges the top toe instead of filling it. Proper rod angle, steady motion, tight arc, and clean mill scale prevent this defect that weakens the joint.
• ⚠️Sticking and unstable arc from incorrect amperage: Low amperage makes the electrode stick to the workpiece, while excessive amperage causes spatter, burn-through, and a weak bead profile. Correct machine settings keep the arc stable and the weld sound.
• ⚠️Hidden slag inclusion in multipass work: Slag not fully chipped and brushed between passes becomes trapped between beads, interrupting fusion and weakening the weld. This matters in thick fillet welds and structural gussets on machine frames.