Which statement is true about 4043 and 5356 filler metals used in GTAW for aluminum?

Which statement is true about 4043 and 5356 filler metals used in GTAW for aluminum?

• A. It contains magnesium
• B. It contains silicon
• C. It contains copper
• D. It contains boron

Answer: (B)

Silicon is the common element in these GTAW aluminum fillers, and that shared content is what makes the statement true. Silicon in aluminum fillers like 4043 and 5356 helps the weld metal flow more easily and reduces the tendency for hot cracking, which is especially important when joining aluminum. 4043 is an aluminum-silicon filler, designed specifically to enhance fluidity with a significant silicon content. 5356 is mainly aluminum with magnesium to increase strength, but it still contains silicon in smaller amounts as part of its overall alloy chemistry. Because both fillers include silicon, the claim that they contain silicon is accurate. Copper or boron aren’t characteristic constituents of these common aluminum fillers, and while magnesium is a key component of 5356, that difference doesn’t apply to the shared silicon feature.

Silicon is the common element in these GTAW aluminum fillers, and that shared content is what makes the statement true. Silicon in aluminum fillers like 4043 and 5356 helps the weld metal flow more easily and reduces the tendency for hot cracking, which is especially important when joining aluminum. 4043 is an aluminum-silicon filler, designed specifically to enhance fluidity with a significant silicon content. 5356 is mainly aluminum with magnesium to increase strength, but it still contains silicon in smaller amounts as part of its overall alloy chemistry. Because both fillers include silicon, the claim that they contain silicon is accurate. Copper or boron aren’t characteristic constituents of these common aluminum fillers, and while magnesium is a key component of 5356, that difference doesn’t apply to the shared silicon feature.