Meaning
Precision joining technique that employs a non-consumable tungsten electrode to produce an arc at very low amperages. Micro TIG welding provides the control necessary to repair delicate mould features such as thin ribs or sharp shut-offs. The process minimizes the heat affected zone to prevent tool warping.
Thermal Management
Concentrated heat allows for the melting of a small filler wire without heating the entire mould block. Micro TIG welding reduces the risk of sink marks or hardness changes in the surrounding steel. This localized control is essential for maintaining the integrity of polished surfaces.
Weld Geometry
Operators use a microscope to guide the electrode and filler material with high accuracy. The beads created by micro TIG welding are much smaller than those from standard industrial welding. This precision means less material needs to be removed during the subsequent benching and polishing phases.
Filler Compatibility
Selecting a wire that matches the base tool steel ensures uniform hardness after the repair. Micro TIG welding supports various grades of H13 or S7 to maintain the wear resistance of the original surface. A mismatch in materials can lead to uneven etching or visible witness lines in the moulded part.
Accurate alloy matching is the only way to ensure the repair is invisible to the naked eye.
