G-TECH CuSn7

SMAW
  • COPPER ALLOYS
CuSn

Description

Electrode with special basic coating
It's particularly suitable for welding and recharging of phosphorous bronze or similar, brass and for recharging cast iron and carbon steel. It is used for the construction of pump blades, turbines, parts subject to wear, such as sliding guides, sliders, seats of valves, for repairing foundry and plating defects on tough steel to sea water. The higher tin content increases strength and wear resistance and increases the solidification temperature range during deposition of the weld metal (lower preheating to about 200°C is required).
Specifications
AWS A5.6
ECuSn-C
DIN 1733
CuSn7
Shielding
-
Positions
PA, PB, PC, PD, PF
Current
DC+
Packaging Type
Carton box
Asme qualifications
F-No (QW432)
33
A-No (QW442)
-

Hardness

90HB
Chem. Comp. %
DEFAULT
Mn
0.1
Sn
8
P
0.2
Mechanical Properties
min
variant
Tensile strength Rm MPa
280
340
Yield strength Rp0.2 MPa
-
140
Elongation A (L0=5d0) %
20
40
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
Description

Application

Used for welding various copper-based alloys to themselves, CMn steels, or cast irons, and for repairing and joining castings, this consumable is also suitable for weld surfacing to provide a bearing surface and/or corrosion-resistant overlay on steel components, shafts, etc. Avoiding stainless steels is recommended due to chromium pick-up causing embrittlement. The tin bronze weld metal can be sluggish due to its wide melting range. Preheating to approximately 200°C can enhance fluidity when dealing with thick sections. To prevent hot cracking, it's advisable to maintain the interpass temperature below 200°C. This consumable is also applicable for welding copper materials if the presence of tin in the weld metal is acceptable, such as in copper and tin bronzes, particularly for joining copper-zinc alloys and steels. For multi-layer welding on steel, pulsed arc welding is advised, and it is also suitable for oven soldering.

Alloy Type

Tin bronze alloy wire for welding similar tin bronze (phosphor bronze) alloys.

Microstructure

A multi phase copper base structure with complex eutectoids.

Materials

Tin bronze up to 10%Sn+0.5%P. Cu + 20-25%Sn. Cu + 40%Zn, manganese bronze.

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