What are the differences between carbon rods of different diameters in welding repair scenarios?

What are the differences between carbon rods of different diameters in welding repair scenarios?

φ3–φ6 mm (small diameter), ≤6 mm (thin plate): Shallow surface defects: micropores, point inclusions, weld surface cracks, defects in narrow sections.

φ6–φ8 mm (medium diameter), 6–16 mm (medium-thick plate): Medium depth defects: cracks <50 mm in length, dense porosity, incomplete penetration at the weld root.

φ8–φ12 mm (large diameter), ≥16 mm (thick/extra-thick plate): Deep defects: long cracks, thick slag inclusions, dense internal defects in the weld, beveling repair of thick plates.

Small diameter carbon rods (φ3–φ6 mm): Suitable for: repair of thin plates (thickness ≤6 mm), removal of shallow surface defects (porosity, micro-slag inclusions), fine root cleaning of welds, and treatment of defects in narrow sections.

Medium-diameter carbon steel rods (φ6–φ8 mm) are suitable for: repairing medium-thick plates (thickness 6–16 mm), removing medium-depth defects (cracks <50 mm in length, dense porosity), and cleaning the root of conventional welds.

Large-diameter carbon steel rods (φ8–φ12 mm) are suitable for: repairing thick/extra-thick plates (thickness ≥16 mm), removing deep defects (long cracks, thick slag inclusions), and rough planing of large defect areas.