Welding: Principles and Applicatio...

8th Edition
Larry Jeffus
ISBN: 9781305494695



Welding: Principles and Applicatio...

8th Edition
Larry Jeffus
ISBN: 9781305494695
Textbook Problem

Why should copper-phosphorus not be used on fittings with ferrous substrates?

To determine

The reason of not using copper-phosphorus on fittings with ferrous substrates.


The copper and phosphorus alloy commonly referred as phos-copper alloy. Phos-copper alloy has very good fluidity and wettability for copper and copper alloys.

For the strongest joint, the joint spacing is maintained in the range of 0.03 mm to 0.12 mm. It is to be considered that there should not be any build-up of this alloy. This build-up of the alloy may cause brittleness of the joint.

A brittle alloy of phosphorous, iron phosphide may form when brazing is done on the steel. This iron phosphide forms due to elevated temperatures required for the brazing.

This alloy of copper and phosphorus should not be used with ferrous fittings and substrates because the copper present in the alloy easily burns off. This burning off of the copper exposes the underlying metal to phosphorus embrittlement.

The metal which is made by combining two or more metallic elements, or one metallic element and one non-metallic element...

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