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Beryllium-Copper vs Chromium-Copper

Beryllium-Copper vs Chromium-Copper

Beryllium-Copper vs Chromium-Copper

(OP)
Currently, we are using chromium-copper for electrodes in our projection welding processes. Due to several "Quality" isssues, a question has arised about using beryllium-copper, instead. I understand that this is a more durable material, but could the lower conductivity of the beryllium-copper cause issue? Can anyone provide info on a comparison of the 2 materials.

Thank you.

RE: Beryllium-Copper vs Chromium-Copper

I can't give a definite answer (probably depends upon cycle & weld material parameters), but it seems worth testing the beryllium copper.  For maximum conductivity, try the ‘low beryllium’ C17500 alloy in the fully age hardened condition.  Possibly, a brief delay prior to applying current to lose some heat to the workpiece would allow use of a harder Be copper alloy.  Some material parameters:

Material       Alloy              YS, MPa      Hard.,HV  %IACS   Thermal cond.
0.7%Cr       C18500               530           125        80-85        324 W/m-K
low Be        C17500            650-870        230       45-52        200 W/m-K
Be copper C17200,C17400  965-1340   360-420    22-25        105-130 W/m-K
cast “    “    C82400               965           367          18            100 est.   

Notes:  Properties for all alloys in precipitation hardened condition.
    The 0.8%Cr C18400 alloy has approximately the same values as C18500.
    ‘low Be’ is 99.6Cu-0.6Be-2.5Co in HT (TH04) Temper.
Data are from MatWeb.com, ‘Copper and Copper Alloys: Compositions and Mechanical Properties,’ CDA No. 36, 12th Edn., London (1964), and Metals Handbook, Vol. 2, 8th Edn., ASM, Metals Park, OH (1964).

Please report any results.

RE: Beryllium-Copper vs Chromium-Copper

(OP)
Thanks for the information...and the reply

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