Electrode lead for condensing boiler, has longitudinal ribs formed at surface of lead, on part of length of rod, where ribs are regularly distributed at periphery of lead and formed by knurling of lead in bar

摘要

The lead (3) has longitudinal ribs (11) i.e. standard geometric shaped grooves, formed at the surface of the lead, on a part of the length of the rod. The ribs are regularly distributed at the periphery of the lead. The ribs are formed by knurling of the lead in bar. The thickness of the ribs is between three to twenty percentages of the diameter of the lead. The ribs are made of malleable metal alloy resistant to corrosion of boiler combustion gas with twenty two percentage of chromium, five percentage of aluminum and seventy three percentage of iron.