AWS A5.8 RBCuZn-B
Copper-Zinc Filler Metals for Brazing, Welding Wire — RBCuZn-B
RBCuZn-B
RBCuZn-B (low-fuming brass-nickel) braze welding rods are similar to RBCuZn-A rods but contain additions of iron and manganese which serve to increase the hardness and strength. In addition, a small amount of silicon [0.04% to 0.20%] serves to control the vaporization of the zinc, yielding the “low-fuming” property. The nickel addition [0.2% to 0.8%] assures uniform distribution of the iron in the deposit.
The filler metal is used for brazing and braze welding of steel, cast iron, copper, copper alloys, nickel, nickel alloys, and stainless steel. RBCuZn-B filler metal also is used for the surfacing of steel. It is used in torch, induction, and furnace processes. Flux and joint clearances from 0.002 in to 0.005 in [0.05 mm to 0.13 mm] are suitable.
| Nominal Chemical Composition (%) | Melting Point | Flow Point | Brazing Temperature | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cu | Zn | Sn | Fe | Mn | Ni | P | Pb | Al | Si | TOEa | °F | °C | °F | °C | °F | °C |
| 56.0-60.0c | BAL | 0.80-1.10 | 0.25-1.20 | 0.01-0.50 | 0.20-0.80d | – | 0.05* max | 0.01* max | 0.04-0.20 | 0.50 maxb | 1590 | 866 | 1620 | 882 | 1620-1800 | 882-982 |
a The filler metal shall be analysed for those specific elements for which values or asteriks (*) are shown in this table. If the presence of other elements is indicated in the course of this work, the amount of those elements shall be determined to ensure their total does not exceed the limit specified in “Total Other Elements, TOE.”
b The total of all other elements, including those for which a maximum value or an asterisk (*) is shown, shall not exceed the value specified in “Total Other Elements, TOE.”
c Includes residual silver.
d Includes residual cobalt.