original_query: What is the purpose of Part C - Specifications for Welding Rods, Electrodes, and Filler Metals?
  What is the most relevant chunk to answer the query?
query: What is the purpose of ASME BPVC Section II Part C - Specifications for Welding Rods, Electrodes, and Filler Metals?
answer: ASME BPVC Section II Part C provides mechanical properties, heat treatment, chemical composition analysis, test specimens, and testing methodologies for welding rods, filler metals, and electrodes used in pressure vessel construction.