How-To: Micro Welding Mold & Die Repair

Micro welding is designed for precise mold and die repair with minimal heat input, helping reduce distortion while restoring edges, corners, parting lines, and small defects. Below is a practical workflow you can adapt to your toolroom standards.

Step-by-Step Micro Welding Workflow

1) Inspect the defect and define the repair zone

• Identify cracks, chips, edge wear, parting-line damage, or pin hole erosion
• Confirm the tool steel or substrate and select compatible filler
• Decide whether you need build-up, edge restoration, or localized fill

2) Prepare the surface

• Clean oil, residue, and oxidation from the repair area
• Lightly prep the zone to ensure good bond and stable weld behavior
• Mask or protect nearby cosmetic surfaces if needed

3) Choose your filler type and size

• Use wire, powder, or ribbon based on access and defect profile
• Match chemistry to the tool steel whenever possible
• Select a size that supports control without overbuilding

4) Apply the repair with controlled heat input

• Build in small passes to maintain precision and minimize heat
• Keep the repair localized, especially on fine edges and shut-offs
• Use a steady hand, consistent spacing, and repeatable settings

5) Finish and validate

• Blend and finish the repaired area to restore geometry and surface function
• Verify fit, shut-off, edge definition, and parting-line integrity
• Document settings and filler selection for repeatability next time