Filler Metal Introduction


Primary alloying elements are Cu,Si,Mg ,Mn and Zn. These alloys are classified to:Heat-Treatable and Non Heat-treatable.

Heat treatable alloys increase their mechanical performance by heat treatment. Heat treatment an alloy means to heat it at a certain temperature, put the alloying elements into a solid solution and cool it at a rate that allows a saturated solution to be created, and then keep it at a low temperature for a time to produce a certain amount of condensation of the alloying elements.

Non Heat-treatable alloys can only increase their strength by cold working and strain hardening.

Most commonly used alloys are wrought alloys. Wrought alloys have 4 digits. The first digit shows the primary alloying element. .If the second digit is not 0,it indicates that the original recorded alloy has been modified in some way. The third and fourth digits are assigned arbitrary numbers for specific alloys, except the 1XXX series alloys, which are almost pure aluminum. For this series, these numbers indicate purity levels above 99.00%. For example, 1080 represents 99.80% pure aluminum.

Filler Metal Selection

Applied to various structure welding of aluminum base material

Filler Metal Characteristics


Pure Aluminum(1XXX series) Contains no alloying elements, and is not heat-treatable. It is used primarily in chemical tanks and pipe because of its superior corrosion resistance. This series is also used in electrical bus conductors because of its excellent electrical conductivity. It is welded easily with 1100 and 4043 filler wires.

Copper(2XXX series) Provides high strength to aluminum. This series is heat-treatable and mainly used in aircraft parts, rivet sand screw products. Most 2XXX series alloys are considered poor for arc welding because of their sensitivity to hot cracking. Most of these alloys should not be welded, however, alloys2014, 2219 and 2519 are easily welded with 4043 or 2319 filler wire. These three alloys are widely used in welded fabrication.

Manganese(3XXX series) is a non heat-treatable series used for general-purpose fabrication and build-up. Moderate in strength, the 3XXX series is used for forming applications including utility and van trailer sheet. Its moderate strengths prevent this series from being used in structural applications.

Silicon(4XXX series) Silicon reduces the melting point of the aluminum and improves fluidity. Its principle use is as filler metal. The 4XXX series has good weldability and is considered a non heat-treatable alloy. Alloy 4047 is often used in the automotive industry as it is very fluid and good for brazing and welding.

Magnesium(5XXX series) When added to aluminum, magnesium has excellent weldability, good structural strength and is not prone to hot cracking. In fact, the 5XXX series has the highest strength of the non heat-treatable aluminum alloys. It is used for chemical storage tanks and pressure vessels as well as structural applications, railway cars, dump trucks and bridges because of its corrosion resistance.

Silicon and Magnesium(6XXX series) This medium strength, heat-treatable series, is primarily used in automotive, pipe, railings, and structural extrusion applications. The 6XXX series is prone to hot cracking, but this problem can be overcome by the correct choice of joint and filler metal. Can be welded with either5XXX or 4XXX series without cracking — adequate dilution of the base alloys with selected filler wire is essential. A 4043 filler wire is the most common for use with this series.

Zinc(7XXX series) Zinc added to aluminum with magnesium and copper produces the highest strength heat-treatable aluminum alloy. It is primarily used in the aircraft industry. The weldability of the 7XXX series is compromised in higher copper grades, as many of these grades are crack sensitive (due to wide melting ranges and low solidus melting temperatures).Grades 7005 and 7039 are weldable with 5XXX filler wires. They are widely used for bicycle frames and other extruded applications.

Products Quality Guarantee


Control of alloying elements: Making Aluminum wire is a complicated process. We use automatically tilting furnace to make the rod effectively .We strictly control the chemical composition to refine the elements and minimize the alkaline metal and impurities.

Continuous casting: We use the continuous casting process specially designed for making high quality aluminum alloys, this process guaranteed the purity of the rod.

Drawing of the wire: In the final process, we use superior drawing technics to ensure the surface integrity and internal stability .This is the key to make a high quality welding wire.




GOLDING provides all types of aluminum welding wire ,applied to automobile, heavy-duty, shipbuilding industries, etc.