ER 4043 and 5356 are the most common aluminum filler alloys. In fact, these two alloys
make up 80 percent of all aluminum welding wire sold. So it stands to reason that one of
the two is the right choice for most applications. While 5356 is stronger than 4043 and
4047, it has more ductility. The 4043 wire has limited ductility, perhaps 7 to 8 percent.
The 4047 wire has very little ductility, perhaps 2 to 4 percent. Most structural designs
don't take ductility into account.
The filler alloy 4047 was originally developed as a brazing alloy (BAlSi-4) and has low
melting point and narrow freezing range.The 4043 wire has a solidus temperature of
573 deg.C and a liquidus temperature of 632 deg.C, or a melting range of 40 degrees C.
The 4047 wire has a solidus temperature of 573 deg.C and a liquidus temperature of
582 deg. C, or a melting range of 9 degrees C.
The temperature difference between the liquidus and solidus is called the melting range.
It can be shown that the resistance to weld cracking is related to the melting range.
The smaller the melting range, the more crack-resistant the alloy.
Therefore, I recommend ER 4047 filler wire with 12 % Si in place of ER 4043 which has
5 % Si The additional silicon has several effects. 4047 is more crack-resistant than 4043,
which is crack-resistant in its own right. This is the real advantage of 4047 over 4043. If
you are using 4043 and still have weld cracking problems, try 4047. It probably will not
crack.
The 4047 wire has two other advantages over 4043 wire. First, it is a bit stronger than
4043. Has improved cosmetic appearance, particularly when welding thin material.
Additional benefits from the 4047 filler alloy over the 4043 are minimizing solidification
cracking and slightly higher fillet weld shear strength.
In terms of the AWS D1.2 Structural Welding Code for Aluminum, 4047 is acceptable
as a replacement for 4043 as both of these filler alloys have the same "F" number (F23).
The 4047 filler alloy like the 4043 is suitable for elevated temperature service.
Hence, when you have an application that shows center line weld cracking with 4043,
try 4047 which is fully crack resistant.
C Sridhar. AIWT- Chennai.
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On Sat, Dec 9, 2017 at 11:06 AM, Sathish Kumar <sathishmech04@gmail.com> wrote:
Dear All
Thanks for the feedback.
I have tried with fillerwire ER4043 also in trial basis. But same problem we have facing.
Wrap around bend test 16T is followed for bend test. Ultra high purity argon used for welding. Spray transfer mode is followed with current 190-220 Amps, Volt 22-24, HI- 0.9KJ/mm with no weaving.
But facing same problem. Any other inputs need to be added, kindly Clarify
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