SIL-TRODE®

Alternative and trade names
AWS A5.7 Class ER CuSi-A
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Description

A silicon bronze welding alloy (UNS C65600) for the inert gas welding of copper-silicon, copper zinc, copper to copper and also mild steel. Used extensively in the welding of galvanized steel. The silicon content of 2.8-4%, increases tensile strength, hardness, and work hardening rates.


Silicon bronze also provides good corrosion resistance and has good weldability.


Silicon bronze is hot short and extreme care must be exercised to avoid overheating the joint which tends to cause cracking.

Equivalent Materials

This material data has been provided by AMPCO METAL.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

Ashby charts

Properties

General

PropertyValue

Recycled Content

80 %

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Mechanical

PropertyTemperatureValueComment

Elongation

23.0 °C

40 %

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in 2″ (51 mm)

Hardness, Brinell

23.0 °C

80 [-]

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BHN (500 kg) 1/4″ deposit

Tensile strength

23.0 °C

350 MPa

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Chemical properties

PropertyValueComment

Aluminium

0.01 %

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max.

Copper

Balance, including silver

Iron

0.5 %

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max.

Lead

0.02 %

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max.

Manganese

1.5 %

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max.

Other

0.5 %

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max.

Silicon

2.8 - 4 %

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Tin

1 %

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max.

Zinc

1 %

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max.

Technological properties

Property
Processing methods

Welding Procedure:

With gas metal-arc welding, the weld metal should be deposited in stringer beads, maintaining a small molten pool to avoid overheating the hot short silicon bronze base metal. Use argon gas for shielding and relatively high welding travel speeds.


With the gas-tungsten arc welding process, welding is accomplished with dcen current and argon or helium gas shielding. ACHF with argon gas shielding may be used to take advantage of the arc cleaning action.


Preheat: Preheat slightly to remove moisture. Interpass temperature should not exceed 150°F (66°C).