G-TECH 99.8

SMAW
  • ALUMINIUM ALLOYS
Al

Description

Al coated electrode for welding of pure and mostly pure aluminum
It displays good weldability and no porosity. When welding, hold the electrode at a right angle to the workpiece, with a short arc. Wall thicknesses greater than 10 mm and larger workpieces will require preheating from 150°C to 250 °C. Since slag residues are corrosive, they must be completely removed from the weld bead. Pure aluminum generally used in the food industry, in electrical engineering, in the chemical sector and in metallization.
Specifications
AWS A5.3
E1080
DIN 1732
EL-Al 99,8
Werkstoff Number
3.0259
Shielding
-
Positions
PA, PB, PC
Current
DC+
Packaging Type
Carton box
Asme qualifications
F-No (QW432)
43
A-No (QW442)
-

Hardness

18HB - 35HB
Chem. Comp. %
DEFAULT
Si
0.1
Cu
0.02
Fe
0.1
Mechanical Properties
min
variant
Tensile strength Rm MPa
-
80
Yield strength Rp0.2 MPa
-
50
Elongation A (L0=5d0) %
-
25
Impact Charpy ISO-V
-
-
Impact Charpy ISO-V
-
-
Welding Parameters
2.5 mm
3.2 mm
4 mm
Ampere
40A - 70A
60A - 100A
90A - 130A
Voltage
-
-
-
Packaging
pcs/kg
pcs/kg
pcs/kg
Packaging Type
Carton box
Carton box
Carton box
Al
Description

Application

Aluminum consumables for welding of alloys with mostly pure aluminum basis (maximum 0,5% of alloyed elements). Titanium acts as grain refiner offering the material special characteristics as, for example, a higher corrosion resistance. Applications in the chemistry, construction and food industry as well as in electrical engineering, in the chemical sector and in metallization. This alloy is also used for flame and arc spray metallizing.

Alloy Type

Consumables suitable for welding aluminum and pure aluminum alloys.

Microstructure

Pure aluminum (i.e. with a minimum aluminum content of 99.50%) presents a face-centered cubic (fcc) microstructure.

Materials


EN W.Nr.: EN AW-Al 99,0 (1200), EN AW-Al 99,7 (1070A), EN AW-Al 99,5 (1050A), EN AW-Al 99,5 (1350), EN AW-Al 99,8 (1080A).

Welding & PWHT

Weld surfaces often exhibit oxides and weld dirt, appearing in shades of gray to black, predominantly composed of aluminum oxide and magnesium oxide. To prevent lack of fusion defects, it is advisable to eliminate smut and oxides before applying another weld pass. The most straightforward method for this is to use a wire brush, whether manually or power-driven. Ensure the wire brush is clean and exclusively used on aluminum. It's crucial to understand and control the high melting and solidification rate associated with the gas metal arc welding process to avoid entrapped hydrogen gas in the welds and achieve optimal results. For thicker plate materials, preheating to 150°C is necessary for effective welding.

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