Techniweld 404315636 ER4043 5/32" x 36" Tig Wire 10lb/ bxIt contains silicon additives which result in improved fluidity of the weld pool. It has a bright weld finished making it a popular choice for welders. Commonly referred to as AlSi5", has a 5% silicon and is the oldest and one of the most widely used aluminum welding wires for general purpose applications. Used for welding grades 6061, 6063, 5052, 3004, 3003 and cast alloys 356. 0, 357. 0, 413. 0, and 443. 0 to name just a few. Increases fluidity of