G-TECH 401

SMAW
  • COPPER ALLOYS
CuAl

Description

 Special basic coated electrode
Electrode for welding Cu-Al alloys such as bronze-aluminum. Excellent for recharging components subject to wear and for corrosion resistant coatings. Applications include tube sheets, pickling hooks, impellers, valves, chemical plants, paper mills, etc with corrosion and wear. It is excellent for cladding components undergoing metal to metal wear and for corrosion resistant surfaces. Excellent weldability with a spatter free arc, self-releasing slag producing a very smooth bead appearance.
Specifications
AWS A5.6
ECuAl-B
DIN 1733
EL-CuAL8
Shielding
-
Positions
PA, PB, PC, PD, PF
Current
DC+
Packaging Type
Carton box
Asme qualifications
F-No (QW432)
36
A-No (QW442)
-

Hardness

130HB
Chem. Comp. %
DEFAULT
Mn
0.5
Al
8.1
Fe
1.2
Mechanical Properties
min
variant
Tensile strength Rm MPa
450
470
Yield strength Rp0.2 MPa
-
190
Elongation A (L0=5d0) %
20
25
Impact Charpy ISO-V
-
-
Impact Charpy ISO-V
-
-
Welding Parameters
2.5 mm
3.2 mm
4 mm
Ampere
55A - 60A
80A - 90A
100A - 120A
Voltage
-
-
-
Packaging
pcs/kg
pcs/kg
pcs/kg
Packaging Type
Carton box
Carton box
Carton box
CuAl
Description

Application

This welding consumable is designed for welding 5-11% aluminum bronzes and various other copper alloys. In the case of brasses, the weld color closely matches, and the inclusion of aluminum in the filler effectively suppresses zinc volatilization during welding. Moreover, it proves versatile for overlaying carbon-manganese steels and cast irons, providing durable bearing surfaces resistant to wear and corrosion. Additionally, it facilitates the joining of these materials to a wide range of copper-based alloys. Applications for this consumable span a variety of industries, including the manufacturing of corrosion-resistant and spark-resistant pumps, castings, machinery parts, and heat exchangers. Its utility extends to offshore, marine, and mining equipment, where its capability to deliver wear and corrosion resistance makes it an excellent choice for demanding operational environments.

Alloy Type

9% Al bronze for welding similar 5-11% Al alloys.

Microstructure

In the as-welded condition consists of a duplex α + β microstructure.

Materials

Aluminum bronze. Beryllium copper: Cu+ 0.5-2%Be. Brass: Cu–Zn. Aluminum brass: e.g. Yorkalbro Cu-22%Zn-2%Al. Manganese bronze: Cu + 20-45%Zn + 1-3%Mn. Silicon bronze: Cu + 1-3.5%Si.
EN W.Nr.: 2.0916 (CuAl5), 2.0920 (CuAl8), 2.0928 (G-CuAl9), 2.0932 (CuAl8Fe3), 2.0936 (CuAl10Fe3Mn2), 2.0940 (CuAl10Fe2-C), 2.0960 (CuAl9Mn2), 2.0962 (G-CuAl8Mn), 2.0966 (CuAl10Ni5Fe4), 2.0970 (CuAl10Ni3Fe2-C), 2.0978 (CuAl11Ni6Fe5), 2.0980 (CuAl11Fe6Ni6-C).
UNS: C61400.
PROPRIETARY: Alloy D (Hastelloy).

Welding & PWHT

Aluminum bronze alloys do not necessitate preheating, and the maximum interpass temperature should be maintained at 200°C. For welding brass, a preheat ranging from 100-300°C is recommended for thicker sections, with lower preheat temperatures applicable to high-zinc brasses. While the wire is suitable for various dissimilar combinations of copper and ferrous alloys, caution is essential to minimize dilution by high chromium alloys like stainless steels. The limited tolerance to chromium pick-up may lead to embrittlement and cracking, particularly when subjected to bend tests. Employing low heat input buttering proves beneficial in such scenarios.

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