Brass – Wrought: C20500 to C28580 | Cast: C83300 to C85800
With the exception of alloys containing lead, all brasses are weldable. Those with low zinc are the most easily welded. Low-zinc brasses, less than 20% zinc, have good weldability. By comparison, high-zinc brasses, over 20%, have only fair weldability. Lastly, cast brasses are only marginally weldable.
The recommended fillers for low zinc brasses are Cu 6328 and Cu 6560.
If you have more questions about it, we made a blog post for Muntz c280 brass. Check it out!
Tin Brass – Wrought: C40400 to C48600 | Cast: C83300 to C84800
Unleaded tin brass alloys have fair weldability. However, they are prone to hot cracking and forming oxide films on the weld pool. Therefore, high welding heat inputs, high preheat, and slow cooling rates should be avoided. Leaded tin brass alloys are generally considered unweldable.
Phosphor Bronze – Wrought: C50100 to C52400 | Cast: C90200 to C91700
Unleaded phosphor bronze alloys have fair weldbility. But, under stressed conditions these alloys are subject to hot cracking. So like tin brass, high heat inputs, high preheat, and slow cooling rates should be avoided. You can carefully weld leaded phosphor bronze using SMAW. Keep in mind that weldability of these alloys decreases as lead content increases. The most frequently used phosphor bronze alloy is best suited to Cu 5180 filler metal.
Aluminum Bronze – Wrought: C60800 to C64210 | Cast: C95200 to C95900
The low electrical and thermal conductivity of aluminum bronze alloys enhances their weldability. However, is it crucial to remove all of the aluminum oxide layer on the surface of the material before welding. For aluminum bronze alloys with less than 7.8% aluminum, Cu 6240 and Cu 6100 are ideal filler metals. While alloys with aluminum content greater than 7.8% are better suited with Cu 6180 and Cu 6100. Aluminum silicon bronze, C64200, is best paired with Cu 6100.
Silicon Bronze – Wrought: C64700 to C66100 | Cast: C87000 to C87999
Silicon bronzes are arguably the easiest of all the bronzes to weld. Unlike many other copper alloys, their thermal conductivity is relatively low and you can use high welding speeds. These alloys should be stress relieved or annealed prior to welding, slowly heated to the desired temperature, and then rapidly cooled through the critical temperature range. Silicon bronzes are readily weldable with Cu 6560 filler metal.
Copper Nickel – Wrought: C70100 to C72950 | Cast: C96200 to C96900
Copper nickel alloys are the most commonly used in welded fabrication projects. Phosphorus and sulfur levels in these alloys is less than 0.02% to ensure good welds. Most copper nickel alloys do not contain a deoxidizer. Therefore fusion welding requires the addition of a deoxodized filler metal. This lowers the risk of porosity in the weld. For copper nickel with a 10% nickel composition, Cu 7071 or Cu 7158 fillers are recommended. For copper nickel with a 30% nickel composition, a Cu 7158 filler is recommended.
Nickel Silver – Wrought: C73500 to C79900 | Cast: C97300 to C97800
Nickel silver alloys possess a weldability similar to brass. Like brass, the weld quality decreases if lead is present. Unleaded nickel silver alloys are considered suitable to weld. Leaded nickel silver alloys are not. Also similar to brasses, alloys with lower zinc content have better weldability. These low-zinc nickel silver alloys are readily weldable with Cu 6328 and Cu 6560 filler metals.