How Copper Becomes Soft and Flexible | 3 Heating Methods

#CopperAnnealing #Metalworking #CopperManufacturing Why does copper change color when heated, and why do some annealing methods keep it bright and clean? Join EL-Handicrafts as we explore 3 fascinating copper annealing methods, from powerful industrial furnaces and vacuum heat treatment to traditional coppersmithing. Copper annealing is a heat treatment process that softens work-hardened copper, restoring its ductility, flexibility, and ability to be bent, pressed, hammered, and shaped into useful products. Discover how different heating and cooling methods affect the appearance of copper and prepare it for manufacturing. 🔥 1. INDUSTRIAL FURNACE ANNEALING The process begins with copper sheets passing through a rolling mill. Two workers stack the sheets onto a movable platform and push them along rails into a large industrial furnace. After approximately 5 hours of heating, the red-hot copper sheets are pulled out of the furnace using mechanical lifting equipment and immersed in water. The intense heat produces steam and bubbling sounds as the copper cools. The cooled sheets are then transported to another workshop, where they are cut into circular blanks, pressed, and gradually formed into copper pitchers. This demonstrates why annealing is important in copper manufacturing: softened copper can undergo further forming operations more easily. ⚙️ 2. VACUUM ANNEALING In the second method, workers carefully arrange copper sheets inside a special rack and lower it into a vacuum annealing furnace. The copper undergoes approximately 24 hours of heat treatment, followed by 16 hours of cooling. Unlike copper heated in an ordinary furnace exposed to air, copper annealed under suitable vacuum conditions can retain a cleaner, brighter surface with much less oxidation. After the furnace is opened, workers remove the copper sheets and demonstrate how annealing changes their flexibility. A comparison between work-hardened and annealed copper reveals how heat treatment makes the metal easier to bend and form. 🔥 3. TRADITIONAL COPPER ANNEALING Finally, we visit a traditional coppersmith's workshop. A craftsman heats a small copper pot over an open flame until the metal becomes red-hot. He then immerses it in water before continuing the hammering process. Here is an interesting fact: unlike certain steels that can be hardened by suitable heat treatment followed by rapid cooling, ordinary copper does not become hard simply because it is quenched in water. Instead, annealing softens work-hardened copper, allowing craftsmen to hammer and reshape it more easily. From industrial heat treatment to traditional handcrafted copperware, this video reveals how different annealing processes prepare copper for shaping and manufacturing. 👍 If you enjoy factory processes, copper manufacturing, and traditional craftsmanship, please LIKE this video, SUBSCRIBE to EL-Handicrafts, and share your thoughts in the COMMENTS! Which of these three copper annealing methods surprised you the most? ⏱️ VIDEO CHAPTERS 00:00 – Direct Heat & Water vs. Vacuum Heat Without Water 00:34 – Method 1: Industrial Furnace Annealing 06:39 – Method 2: Vacuum Annealing 12:40 – Method 3: Traditional Copper Annealing Copper Annealing | Vacuum Annealing | Copper Heat Treatment | Industrial Copper Processing | Traditional Coppersmithing