Industry Background
Titanium material is widely adopted for premium optical frames thanks to its lightweight and hypoallergenic features. However, titanium is prone to oxidation under high heat, and thin nose pad brackets often suffer fractured solder joints, which has long been a common quality challenge across the global eyewear manufacturing sector. To stabilize mass production quality, the technical team of Mellume Optical carried out a full optimization project for the silver brazing procedure.
Optimized Silver Brazing Procedures for Frames & Nose Pads
The attached on-site photo records technicians performing precision silver brazing on ultra-thin round titanium frames and nose pad bases. Targeted upgrades are applied to two high-failure areas: frame hinges and tiny nose pad solder points, with five standardized operation rules implemented:
Standard Pre-Weld Substrate Treatment
Mechanical polishing removes oxide film, machining oil and mold release residue on welding contact surfaces. Operators are forbidden to touch welding zones with bare hands to avoid secondary oxidation and weak cold solder joints. Extra-fine titanium nose pad supports receive gentle polishing to prevent shape deformation.
Gradient Surrounding Constant Heating System
Direct single-point flame heating is replaced by whole-workpiece gradient preheating. Low-melting silver solder wire melts via residual heat of the base metal to fill gaps. This method reduces titanium grain embrittlement caused by overheating and prevents burn-through on slim nose pad arms, improving basic tensile strength of solder joints.
Quantified Flux Coating & Double-Layer Reinforced Brazing Structure
Flux is thinly and evenly coated only on splicing gaps with controlled dosage to avoid slag inclusion, air holes and long-term corrosion. For micro nose pad solder spots, a two-layer brazing structure is adopted: the base layer fills micro gaps, while a thin outer reinforcing layer boosts load capacity without ruining streamlined visual appearance.
Fixed Fixture Positioning System
Custom clamps lock frame outlines and nose pad arm angles throughout welding to eliminate displacement and thermal deformation. Symmetrical stress distribution on left and right nose pads lowers cracking risks from daily folding and logistics vibration.
Updated Cooling & Batch Inspection Standards
Warmed frames cool naturally at room temperature; rapid water quenching is banned to eliminate internal stress. A fatigue test (50 repeated nose pad opening-closing cycles with zero cracks required) and solder joint pull force test are added to batch checks. All craft parameters and inspection records are archived for full traceability.
Test Results & Application Scope
Internal comparative testing verifies that the optimized process delivers a 35% improvement in overall bending and break resistance for titanium frames, including nose pad connection points, with faint, uniform weld lines.
This upgraded craft applies to Mellume’s full product lines: titanium, stainless steel and mixed-metal frames. It works equally well for large-volume bulk export orders and low-MOQ small-batch custom OEM & ODM projects.
Access to Technical Documents
Existing partners may reach out to dedicated sales representatives to obtain on-site process videos and original mechanical test reports for production batches. For exclusive custom frame designs, the technical team provides one-on-one craft parameter adaptation evaluation.
New to Mellume? Contact our technical team for a free durability test report of our latest titanium collection or to evaluate your custom OEM designs.
Official site: www.mellumeoptical.com
