Prepping Metal Surfaces for Welding with eQualle Sandpaper Sheets (60, 120, 220, 400 Grits)

Clean, smooth metal surfaces are critical for strong welds. Rust, paint, or rough edges can weaken the bond and cause defects. With eQualle Sandpaper Sheets (9 x 11 inches), you can prepare steel, aluminum, or other metals for welding with precision and efficiency.

Why Sanding Matters Before Welding

Contaminants like rust, paint, and mill scale prevent proper fusion. Sanding removes these obstacles and creates a clean, slightly roughened surface for optimal weld penetration.

Essential Tools

• eQualle Sandpaper Sheets (9x11 in)
• Angle grinder or sanding block
• Wire brush for heavy rust
• Protective gloves and goggles
• Welding machine and safety gear

Recommended Grit Sequence

• 60 Grit (25-pack) — For removing heavy rust, mill scale, or paint.
• 120 Grit (50-pack) — For smoothing edges after coarse sanding.
• 220 Grit (25-pack) — For refining the surface before welding.
• 400 Grit (100-pack) — For final polishing when a clean, smooth finish is required.

Step-by-Step Process

1. Inspect the metal. Identify rust, paint, or burrs that need removal.
2. Strip with 60 grit. Remove heavy oxidation or coatings with steady strokes.
3. Smooth with 120 grit. Refine edges and prepare the surface for cleaner welds.
4. Refine with 220 grit. Create a uniform surface that enhances weld adhesion.
5. Final polish with 400 grit. Use when a smooth finish is required before or after welding.
6. Clean thoroughly. Wipe with a solvent or tack cloth before welding.

Special Cases

For stainless steel, avoid overly coarse grits that can leave deep scratches. Begin at 120 grit for light prep work.

Pro Tips

• Always sand in the direction of the weld joint to reduce contamination.
• Replace sandpaper often to maintain cutting efficiency.
• Use wet sanding with finer grits to minimize dust and heat buildup.
• Store eQualle sheets in a dry place to prevent moisture damage.

Aftercare

• Apply a rust inhibitor to unfinished steel after sanding if welding will be delayed.
• Keep surfaces clean and dust-free before starting the weld.
• Post-weld sanding with 400 grit enhances appearance and smoothness.

FAQs

• Do I need to sand aluminum before welding? Yes, light sanding with 220 grit helps remove oxidation.
• Can I weld over paint? No, always remove paint first for safety and weld strength.
• Is 60 grit too coarse for stainless steel? Yes, start finer (120 grit) to avoid scratches on stainless.

Video Guide

For strong, clean welds, rely on eQualle Sandpaper Sheets (9x11 inches). Discover more grit options in our Metal Sanding Collection.