Lead came soldering

Lead came soldering is an essential technique in traditional stained glass making, joining glass pieces with precision and durability.

About this subject

Lead came soldering is a critical process in stained glass artistry. Lead came, a H-shaped channel, wraps around glass pieces to form the panel's framework. To join these channels at intersections, the artisan uses a soldering iron heated to around 350°C, applying a tin-lead alloy (solder) over a flux coating that cleans and prepares the metal surface.

This technique dates back to the Middle Ages; Gothic cathedrals like Chartres (13th century) already used lead came. Solder not only fixes joints but also adds structural strength. After soldering, a cement (putty) is applied to seal and waterproof the panel, ensuring longevity. Precision is crucial: too much heat can warp the came, while insufficient solder weakens stability.

Standard tools include a soldering iron (copper tip), liquid or paste flux (e.g., resin or diluted muriatic acid), and 60/40 solder (60% tin, 40% lead). Flux selection depends on the came type and technique. Modern artisans also use copper or zinc came, but lead remains favored for its malleability and traditional look. Lead came soldering is a valued skill in restoration studios and contemporary stained glass workshops.

Frequently Asked Questions

What is the difference between lead came and copper foil soldering?

Lead came uses H-shaped lead channels, ideal for large, straight panels. Copper foil (Tiffany technique) wraps each glass piece with copper tape, allowing curves and fine details. Soldering came requires less joint precision, while copper foil solder forms the structure itself.

Can you solder lead came without flux?

Not recommended. Flux removes oxides and promotes solder adhesion. Without it, solder won't flow evenly and the joint will be weak. Common fluxes include diluted muriatic acid or organic flux.

What safety precautions are needed for lead soldering?

Work in a ventilated area to avoid fume inhalation. Wear gloves and safety glasses. Wash hands after handling. Avoid ingesting lead particles. Keep children and pets away.