Weldmet stock 1050 (aka 1100 but usually only in the US) wire in all the common sizes FWIW. Any welding store in the known universe should be willing/able to get it for you easily.
As i said you do NOT want 4043 for this sort of work. 4043 is harder and more brittle i.e. it will be more prone to cracking when planishing out and wheeling welds. Welds made with 4043 will also (relatively speaking) stand out like a sore thumb on a part made from 1050 aluminium and mirror polished.
Should probably bring up solidification (hot) cracking...
4043 is often recommended on the basis that it's easier to use and more resistant to hot cracking. Silicon improves fluidity (weld 'wets out' better/easily) and lowers the melting temp- weld freezes over a wider temp range remaining 'mushy' for longer which helps with regards to shrinkage stresses as it freezes
1050 is more prone to solidification cracking but generally problems only occur with poor technique- underfilled welds, leaving craters at the end of welds etc.
Using 4043 on an alloy that contains no silicon results in a diluted silicon content (4043 mixed with pure Al). Should note that aluminium-silicon alloys are crack sensitive at around 0.5-2% Si (most sensitive at just under 1%) and while 4043 has 5% Si to take dilution into account welds are going to be 'closer' to the sensitive region when welding 1050 than if say welding 6082 which contains around 1% Si by design
As i said you do NOT want 4043 for this sort of work. 4043 is harder and more brittle i.e. it will be more prone to cracking when planishing out and wheeling welds. Welds made with 4043 will also (relatively speaking) stand out like a sore thumb on a part made from 1050 aluminium and mirror polished.
Should probably bring up solidification (hot) cracking...
4043 is often recommended on the basis that it's easier to use and more resistant to hot cracking. Silicon improves fluidity (weld 'wets out' better/easily) and lowers the melting temp- weld freezes over a wider temp range remaining 'mushy' for longer which helps with regards to shrinkage stresses as it freezes
1050 is more prone to solidification cracking but generally problems only occur with poor technique- underfilled welds, leaving craters at the end of welds etc.
Using 4043 on an alloy that contains no silicon results in a diluted silicon content (4043 mixed with pure Al). Should note that aluminium-silicon alloys are crack sensitive at around 0.5-2% Si (most sensitive at just under 1%) and while 4043 has 5% Si to take dilution into account welds are going to be 'closer' to the sensitive region when welding 1050 than if say welding 6082 which contains around 1% Si by design
I am sure the record is been broken every day. Don't worry it gets easier
