{"id":8305,"date":"2025-03-15T06:41:18","date_gmt":"2025-03-15T06:41:18","guid":{"rendered":"https:\/\/premiumalu.com\/?post_type=product&p=8305"},"modified":"2026-07-07T08:32:46","modified_gmt":"2026-07-07T08:32:46","slug":"lega-di-alluminio-4143","status":"publish","type":"product","link":"https:\/\/premiumalu.com\/it\/prodotto\/lega-di-alluminio-4143\/","title":{"rendered":"Lega di alluminio 4143"},"content":{"rendered":"

What Is 4143 Aluminum Alloy?<\/h2>\n

4143 aluminum (EN AW-4143 \/ UNS A94143) is a silicon-bearing 4xxx series alloy developed primarily as a welding and brazing filler metal. The 6.8\u20138.2% silicon content lowers the melting range and improves molten-metal fluidity, allowing the weld pool to wet and flow across the joint with low hot-cracking tendency.<\/p>\n

Unlike structural 4xxx alloys such as 4032 (which is forged into pistons), 4143 is a consumable filler \u2014 it is drawn into wire and rod for joining other aluminum alloys rather than serving as a load-bearing base metal. A small magnesium addition (0.2\u20131.0%) lets 4143 weld 5xxx-series and 6xxx-series parts while retaining moderate post-weld strength.<\/p>\n

Available 4143 Aluminum Products<\/h2>\n

4143 Welding Wire & Rod<\/h3>\n

The dominant form of 4143. Supplied as spooled MIG wire, cut-length TIG rod, and brazing rod. Temper O (annealed) is standard for welding consumables to ensure soft, feedable wire.<\/p>\n\n\n\n
Lega<\/th>\nTemperamento<\/th>\nDiametro (mm)<\/th>\nForma<\/th>\n<\/tr>\n
4143<\/td>\nO<\/td>\n0.8\u20135.0<\/td>\nSpool wire \/ cut rod<\/td>\n<\/tr>\n<\/table>\n

Custom spool sizes and cut lengths available on request.<\/p>\n

4143 Bar, Sheet & Tube<\/h3>\n

Less common than wire\/rod, but available for brazed assemblies and fabricated filler components.<\/p>\n\n\n\n
Lega<\/th>\nTemperamento<\/th>\nDimension range<\/th>\nLunghezza (mm)<\/th>\n<\/tr>\n
4143<\/td>\nF, O<\/td>\nBar Ø6\u201380 mm \/ Sheet 1\u201350 mm t \/ Tube Ø10\u2013100 mm<\/td>\n1,000\u20136,000<\/td>\n<\/tr>\n<\/table>\n

Specifiche e denominazioni equivalenti<\/h2>\n\n\n\n\n\n\n\n
Standard<\/th>\nDenominazione<\/th>\n<\/tr>\n
EN AW<\/td>\nAW-4143<\/td>\n<\/tr>\n
UNS<\/td>\nA94143<\/td>\n<\/tr>\n
ASTM (Wire\/Rod)<\/td>\nB318<\/td>\n<\/tr>\n
ISO<\/td>\nAlSi7Mg<\/td>\n<\/tr>\n
AWS (Welding)<\/td>\nER4143<\/td>\n<\/tr>\n<\/table>\n

Composizione chimica<\/h2>\n

Per EN 573-3 \/ AWS A5.10:<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Elemento<\/th>\nPeso %<\/th>\n<\/tr>\n
Si<\/td>\n6.8\u20138.2<\/td>\n<\/tr>\n
Fe<\/td>\n0.8 max<\/td>\n<\/tr>\n
Cu<\/td>\n0,25 max<\/td>\n<\/tr>\n
Mn<\/td>\n0,10 max<\/td>\n<\/tr>\n
Mg<\/td>\n0.20\u20131.0<\/td>\n<\/tr>\n
Cr<\/td>\n0,10 max<\/td>\n<\/tr>\n
Zn<\/td>\n0.20 max<\/td>\n<\/tr>\n
Ti<\/td>\n0,10 max<\/td>\n<\/tr>\n
Altri (ciascuno)<\/td>\n0,05 max<\/td>\n<\/tr>\n
Altri (totale)<\/td>\n0,15 max<\/td>\n<\/tr>\n
Al<\/td>\nEquilibrio<\/td>\n<\/tr>\n<\/table>\n

Propriet\u00e0 meccaniche in base al trattamento termico<\/h2>\n

Note: As a filler alloy, 4143 is characterized by its weldability and deposit properties more than by base-metal strength. The values below are for the as-fabricated (F) or annealed (O) base form.<\/p>\n\n\n\n\n
Temperamento<\/th>\nResistenza alla trazione (MPa)<\/th>\nResistenza allo snervamento (MPa)<\/th>\nElongation A50 (%)<\/th>\n<\/tr>\n
F (as fabricated)<\/td>\n120\u2013150<\/td>\n50\u201370<\/td>\n15\u201320<\/td>\n<\/tr>\n
O (ricotto)<\/td>\n110\u2013140<\/td>\n45\u201365<\/td>\n18\u201322<\/td>\n<\/tr>\n<\/table>\n

Welded joint strength depends on the parent alloy and welding procedure, not on 4143 alone. Always qualify the weld per the applicable code.<\/p>\n

Guida alla scelta della tempra<\/h2>\n

O Temper (Annealed) \u2014 Standard for Welding Wire<\/h3>\n

4143 welding consumables are supplied in O temper: fully soft, so MIG wire feeds smoothly through liners and TIG rod is easy to handle. This is the default for ER4143 wire and rod.<\/p>\n

F Temper (As Fabricated)<\/h3>\n

Used for extruded bar, tube, or sheet where 4143 is a component material rather than a consumable \u2014 for example, brazed assemblies or fabricated filler parts.<\/p>\n\n\n\n\n
Temperamento<\/th>\nIl migliore per<\/th>\nKey Advantage<\/th>\n<\/tr>\n
O<\/td>\nWelding wire, brazing rod<\/td>\nSoft, feedable, low hot-crack tendency<\/td>\n<\/tr>\n
F<\/td>\nExtruded bar\/tube\/sheet components<\/td>\nAs-extruded, no extra treatment needed<\/td>\n<\/tr>\n<\/table>\n

Caratteristiche principali<\/h2>\n

Excellent Fluidity & Wetting<\/h3>\n

The 6.8\u20138.2% silicon content gives 4143 a low melting range and free-flowing molten pool. This produces smooth, defect-free welds with good tie-in to the parent metal \u2014 the primary reason it is chosen as a filler.<\/p>\n

Low Hot-Cracking Tendency<\/h3>\n

4143 deposits resist solidification cracking better than high-magnesium or high-copper fillers, making it a reliable general-purpose choice for joining 6xxx and 5xxx alloys.<\/p>\n

Forza moderata<\/h3>\n

Post-weld, 4143 deposits have moderate strength (notch-toughness and yield are lower than structural base metals). For high-strength joints, select a filler matched to the parent alloy’s strength class.<\/p>\n

Resistenza alla corrosione<\/h3>\n

4143 has moderate corrosion resistance \u2014 similar to other silicon filler alloys. It is NOT a marine-grade alloy and should not be selected for seawater-exposed structures. For marine service, 5xxx-series fillers (e.g. 5356) are typically preferred.<\/p>\n

Applicazioni<\/h2>\n

4143 is a consumable alloy used wherever aluminum must be joined:<\/p>\n