Selecting proper aluminum welding wire for 1100 and 1070 pure‑aluminum base metal directly decides joint performance, corrosion resistance and anodizing results. Both grades belong to commercial pure aluminum series, yet their minor chemical differences affect filler metal choice in real‑world workshop jobs.
1070 holds minimum 99.7 % aluminum content. It delivers high electrical conductivity for busbars and conductive parts. 1100 contains 99.0 % aluminum, widely used for architectural panels and general non‑structural components. Many fabricators mix them up and pick wrong filler, which brings porosity, poor ductility or post‑weld discoloration.
Key Differences Between 1070 and 1100 Base Metal
- 1070 aluminum: Higher aluminum purity; top electrical and thermal conductivity; for electrical parts and chemical equipment.
- 1100 aluminum: Slight higher impurity limits; good ductility and corrosion resistance; fit for sheet metal, decoration and non‑critical enclosures.
Note: Do not judge filler selection only by base‑material property tables. Welding service conditions carry more weight.
Recommended Aluminum Welding Wire for 1070 & 1100
ER1100 Filler Metal
ER1100 is the standard matching filler for 1100 base metal. It also works for joining 1070 or dissimilar 1070‑to‑1100 joints.
- Pros: Matched corrosion resistance; good ductility; weld accepts uniform anodizing color.
- Cons: Low weld strength; poor anti‑cracking performance on heavy‑stress structures.
- Best‑fit scenarios: Conductive components, food‑grade tanks, decorative sheets.
View our aluminum welding wire ER1100 product page for full specs and bulk order information.
ER1070 Filler Metal
Use ER1070 when weld joint must keep ultra‑high conductivity, mostly for 1070 base material. This wire keeps the weld’s high‑purity feature without extra alloy elements.
ER4043 Alternative Aluminum Welding Wire for Simple Jobs
You may choose ER4043 aluminum welding wire for simple non‑conductive parts. Silicon inside improves puddle fluidity and reduces hot‑cracking risk. ⚠️ Important reminder: ER4043 weld cannot get consistent anodizing color. Avoid it for conductive or decorative finished surfaces.
Our factory supplies ER4043 aluminum welding wire for non-decorative pure aluminum welding projects.
Common Weld Defects When Using Aluminum Welding Wire on 1070 /1100 Pure Aluminum
Porosity from poor wire feeding and surface contamination
Most porosity comes from surface oxide film or moisture. Remove oxide layers by brushing or grinding before welding. Use pure argon as shielding gas.
Hot cracking
Pure‑aluminum welds have limited anti‑cracking capacity. Do not apply over‑large heat input. Control travel speed and avoid over‑restraint on work‑pieces.
Bad anodizing appearance
Mismatched filler metal creates uneven color after anodizing. For visible parts, stick with ER1100 or ER1070 instead of silicon‑rich wires like ER4043.
Practical Workshop Tips
- Clean base‑metal surface thoroughly before starting. Aluminum oxide is the top hidden trouble source.
- Select wire diameter according to sheet thickness: 1.0‑1.2 mm for thin sheets under 2 mm; 1.6 mm or above for thicker plates.
- Test weld samples first if you handle new material batches. Check ductility and surface look before mass‑production.
FAQ
Q: Can I weld 1070 aluminum with ER5356 wire?
A: Not recommended. ER5356 adds magnesium. Weld loses high conductivity and will fail anodizing matching, though mechanical strength rises.
Q: Which wire for welding 1070 to 1100 dissimilar joint?
A: ER1100 aluminum welding wire is the safe general pick for dissimilar joints of 1070 and 1100.
Q: Do I need pre‑heat for pure‑aluminum welding?
A: Pre‑heat is not required for thin sheets. Pre‑heat thick plates over 8 mm moderately to lower cooling speed.
Closing
Correct aluminum welding wire selection balances conductivity, corrosion resistance and surface finish. Think over your end‑use requirement: conductivity? decoration? mechanical load? Then pick ER1070, ER1100 or ER4043 accordingly.
If you need stable pure‑aluminum filler metal from a 20+ year Chinese aluminum welding wire factory, feel free to contact our team for samples and technical support.
