Laser welding is reshaping how aluminum is joined — EV battery trays, electronic enclosures, heat exchangers and body panels are all moving to the beam. But aluminum is one of the harder metals to laser weld, and in most production applications the filler wire decides whether the joint cracks or holds. This guide covers when laser welding aluminum needs wire, which alloys to use, and what the process demands of the wire itself.雷射（激光）焊接正在改變鋁的接合方式——EV 電池托盤、電子機殼、熱交換器與車身板件都在轉向光束製程。但鋁是較難雷射焊接的金屬之一，在多數量產應用中，接頭會不會裂，往往取決於填料焊線。本指南說明鋁雷射焊接何時需要焊線、該用哪些合金，以及製程對焊線本身的要求。
A laser can weld aluminum autogenously — with no filler at all — but on the most common structural alloys this is asking for trouble. 6xxx alloys such as 6061 and 6063 solidify through a crack-sensitive composition range: welded without filler, the joint is prone to hot cracking. Adding silicon or magnesium through a filler wire (ER4043, ER4047 or ER5356) shifts the weld-metal chemistry out of that range. Filler wire also bridges fit-up gaps — laser joints have very little tolerance for poor fit — and builds a proper reinforcement profile instead of an underfilled seam.雷射可以在完全不加填料的情況下自熔焊接鋁材，但對最常見的結構合金而言，這是自找麻煩。6061、6063 等 6xxx 合金的凝固路徑會經過對熱裂敏感的成分區間：不加填料焊接，接頭極易熱裂。透過焊線（ER4043、ER4047 或 ER5356）加入矽或鎂，可將焊縫金屬成分移出該區間。焊線同時能填補裝配間隙——雷射接頭對裝配不良的容忍度極低——並形成完整的焊冠，而非填充不足的焊縫。
Common practice for aluminum laser welding and laser brazing鋁雷射焊接與雷射釬焊的常見對應
| Application / Base Alloy應用／母材合金 | Recommended Wire建議焊線 | Notes說明 |
|---|---|---|
| 6061 / 6063 | ER4043 / ER4047 | Si filler moves the weld out of the crack-sensitive range; ER4047 (12% Si) has the lowest crack sensitivity and the most fluid pool. Typical for battery trays, enclosures and frames.矽系焊材使焊縫脫離熱裂敏感區；ER4047（12% 矽）裂敏最低、熔池流動性最佳。常見於電池托盤、機殼與框架。 |
| 6xxx, strength-governed6xxx 強度主導接頭 | ER5356 | Higher as-welded strength than ER4043; qualify by WPS for the specific joint.焊態強度高於 ER4043；依 WPS 對特定接頭評定。 |
| 5052 / 5083 | ER5356 / ER5183 | Al-Mg fillers for strength and marine-grade corrosion resistance.鋁鎂焊材，兼顧強度與船規級耐蝕。 |
| Laser brazing (panels, trim)雷射釬焊（板件、飾件） | AlSi12 (ER4047 chemistry)（ER4047 成分） | The standard aluminum laser-brazing alloy: low melting range, fluid and well-wetting for visible seams.鋁雷射釬焊標準合金：熔化區間低、流動與潤濕性佳，適合外觀焊縫。 |
| Laser-arc hybrid, heavy sections雷射-電弧複合焊，厚件 | ER5356 / ER5183 | Hybrid welding runs on standard precision MIG wire, most commonly 1.2–1.6 mm.複合焊使用標準精密 MIG 焊線，最常見 1.2–1.6 mm。 |
Laser welding is far less forgiving of wire quality than hand-held MIG. Four properties dominate:雷射焊接對焊線品質的容忍度遠低於手工 MIG。四項特性最為關鍵：
On diameters: dedicated laser filler wire typically runs 0.8–1.2 mm for cold-wire and hot-wire feeding, while laser-arc hybrid systems use standard 1.2–1.6 mm MIG wire. Whatever the diameter, the quality fundamentals are the same ones that separate good automated MIG wire from commodity wire — only stricter.關於線徑：專用雷射填料線的冷線／熱線送線通常為 0.8–1.2 mm，而雷射-電弧複合焊系統使用標準 1.2–1.6 mm MIG 焊線。無論哪種線徑，品質基本功與區分「自動化級 MIG 焊線」和「大宗商品線」的是同一套——只是更嚴格。
Between pure laser and conventional MIG sits laser-arc hybrid welding: a laser beam and a MIG arc share one weld pool, combining deep penetration with gap tolerance and deposition rate. Hybrid is well established on thick aluminum sections — shipbuilding panels, rail-car bodies, heavy frames — and it runs on standard precision MIG wire, most commonly ER5356 or ER5183 at 1.2–1.6 mm. This is where GOLDING wire operates today: precision layer-wound spools engineered toward a ±0.01 mm diameter target, with clean drawn surfaces and per-batch traceability, feeding automated and hybrid systems without interruption.在純雷射與傳統 MIG 之間是雷射-電弧複合焊：雷射光束與 MIG 電弧共用同一熔池，兼得深熔透、間隙容忍度與熔敷效率。複合焊在厚壁鋁件上已相當成熟——船體板件、軌道車體、重型結構——而它使用的正是標準精密 MIG 焊線，最常見為 1.2–1.6 mm 的 ER5356 或 ER5183。這也是 GOLDING 焊線今天的位置：精密層繞線盤、以 ±0.01 mm 線徑公差為精度目標、潔淨拉絲表面、逐批追溯，讓自動化與複合焊系統送線不中斷。