Overview
Solid core high-temperature solder wire is a specialized metallurgical product formulated for applications where conventional solders would fail under thermal stress. Unlike flux-cored variants, its homogeneous composition ensures consistent performance in demanding environments. Developed primarily for lead-free manufacturing compliance, modern formulations typically combine tin with silver (2-4%) and copper (0.5-1.5%) to achieve melting points exceeding 217°C. The absence of internal flux requires separate flux application during soldering operations.
Physical and Chemical Properties
The material exhibits superior thermal conductivity (50-60 W/m·K) compared to standard solders, with tensile strength ranging 30-50 MPa depending on alloy ratios. Its solid core structure prevents voids and ensures reliable electrical continuity in high-current applications. Oxidation resistance is enhanced through precise alloying, with many formulations maintaining stable performance up to 150°C continuous operating temperatures. The wire's diameter tolerance is typically ±0.02mm, crucial for automated soldering equipment.
Main Applications
Primary industrial use occurs in automotive electronics, particularly for engine control units (ECUs) and transmission sensors requiring 125°C+ operating temperatures. Aerospace applications include avionics and turbine sensor assemblies where thermal cycling resistance is critical. The power electronics sector utilizes this solder for IGBT modules and high-power LED substrates, where its high thermal conductivity prevents joint degradation. Emerging applications include photovoltaic cell interconnects and high-temperature MEMS device packaging.
Safety and Storage
While lead-free, the silver content necessitates proper handling to prevent metal fume exposure. Workshops should implement local exhaust ventilation (LEV) systems during manual soldering operations. Storage requires moisture-proof packaging with desiccants to prevent oxidation. Optimal shelf life is 12 months when stored below 25°C at <40% RH. Opened spools should be transferred to airtight containers with oxygen absorbers.
B2B Procurement Guide
Industrial buyers should specify: alloy composition (e.g., SAC305 vs SAC387), wire diameter tolerance (±0.01mm for precision work), and spool packaging (1kg-5kg industrial reels). Batch certification including RoHS and REACH compliance documents is essential. For high-volume procurement, consider factory audits to verify melting point consistency (typically ±2°C tolerance). Sample testing should evaluate wetting behavior on target substrates under actual production conditions.
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