C17200 / CuBe2 / CW101C

WELDING AND FLAME CUTTING ARE STRONGLY CONTRAINDICATED for C17200. Beryllium oxide fumes generated above 650 degrees C are highly toxic and carcinogenic. If fusion welding is unavoidable in exceptional circumstances: use only in a fully enclosed, purpose-designed beryllium welding facility with LEV extraction and HEPA filtration; respiratory protection (airline supplied-air respirator) mandatory; specialist health and safety assessment required before any welding operation. In almost all applications, silver brazing (BAg-7 or equivalent at 620-680 degrees C in a fume-controlled environment) is the preferred joining method - brazing produces significantly less beryllium oxide fume than fusion welding. Never flame cut C17200 without specialist beryllium extraction equipment. Filler/joining options: AWS BAg-7 silver braze (preferred, fume-controlled environment), AWS BAg-24 silver braze (alternative for less critical joints), and ERCuBe TIG filler (specialist beryllium welding facility only, airline-supplied respirator mandatory).

BERYLLIUM HEALTH AND SAFETY - MANDATORY READING BEFORE MACHINING OR WELDING: Beryllium fumes and dust are highly toxic. Beryllium oxide particles generated during machining, grinding, and especially welding or flame cutting can cause chronic beryllium disease (CBD) - an irreversible, debilitating lung disease - and are classified as a Group 1 human carcinogen (IARC). Engineering controls (wet machining, local exhaust ventilation with HEPA filtration), personal protective equipment (P3/N100 respirator, nitrile gloves, eye protection), and compliance with occupational exposure limits (OEL: 0.00002 mg/m3 chronic, 0.00005 mg/m3 acute - ACGIH TLV) are mandatory. All personnel must be trained in beryllium hazards before handling. Maintain MSDS/SDS on-site at all times. C17200 has good machinability in the AT (solution annealed) condition - approximately 20-30% of free-machining brass machinability index, similar to austenitic stainless steel. All machining MUST be conducted wet (flood coolant mandatory) to prevent beryllium dust generation. NEVER dry machine, dry grind, or dry polish C17200. Use water-based or synthetic coolant (not oil mist). Local exhaust ventilation with HEPA filtration is required. In the HT (hardened) condition, machinability is reduced significantly due to hardness of 36-42 HRC - carbide tooling essential. Preferred sequence: rough machine in AT condition, age to HT, then finish grind or EDM to final dimensions.