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Up Topic Welding Industry / Technical Discussions / Welding of copper alloys to stainless
- By - Date 09-06-2000 05:34
Dear Welding friends:

This is Augustine Yong from Malaysia,
previously studying Master Engineering
Practice in Materials Welding and Joining,
University of Wollongong, Australia.
Currently, I am having a rest after
the intensive study.

Two days ago, I received an inquiry about welding
of strange alloy combinations, as follow:

1) Welding of silicon bronze (Copper with 1.5~3%
Silicon addition) to 304 type stainless steel.

2) Welding of copper-nickel alloys to 304 type
Stainless steel.

After reading some references (ASM Metals
handbook Vol. 6 10th edition and AWS
welding handbook, Vol.3&4 8th Edition),
I just wonder if following practices are
appropriate:

1) Use ERCuAl-A2 (GTAW) / ECuAl-A2 (MMAW) are used
as filler wire for welding of silicon bronze
(Copper with 1.5~3% Silicon addition) to 304
type stainless steel. Limit interpass
temperature to 65 degree Celcius (150 F) to
reduce dilution of chromium that can
cause hot cracking. Degrease the joint
thoroughly before welding. Use DCEN (DC electrode
negative) with thoriated electrode for GTAW process.

2) Use ERCuNi-3 that contains 0.2~0.5% oxygen scavenger
Ti as filler wire when welding Cu-Ni alloys to 304 type
stainless steels with GTAW process. Degrease the joint before
welding to remove trace elements in the machine oil and
contamination of shop soil that might contain lead phosphorous
and sulphure to avoid hot cracking. If 2 passes are deposited,
interpass temperature should be limited to 65 degree Celcius
to reduce the dilution of chromium that can cause hot
cracking in the weld metal.

3) When welding of Cu-Ni alloy to 304 type stainless steel with
MMAW process, butter with ENi-1 or ERNi-1 on stainless steel side
to avoid the dilution of chromium to the weld metal. Then
fill up the groove with copper nickel electrode. ERCuNi-3
is the choice for the filler electrode.Degrease the joint
before welding for the same reasons stated in above.

Please give any suggestion to a fresh guy in welding
industry.:)

Regards,
Augustine Yong.
Lot 6823, Hui Sing Height,
Lorong 7, 93350 Kuching,
Sarawak, Malaysia.
Up Topic Welding Industry / Technical Discussions / Welding of copper alloys to stainless

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