Effect of Preheat on Tensile and Corrosion Properties of Steel Welded Joints

Document Type : Original Article

Authors

1 Dept .of Mechanical Engineering, Al-Azhar University, Cairo, Egypt.

2 Dept. of Mechanical Eng., Higher Technological Institute, 10th. of ramadan City, Egypt.

Abstract

Steels of high carbon content,. in general, have high strength, that makes them
needed in many engineering applications. However, the repair of components made
of such steels through maintenance by welding presents a major problem. Therefore.
in the present investigation a trial is made to find out a way to facilitate the welding
or such high carbon, high strength steel with the objective to improve its mechanical
properties. Preheating to different temperatures was carried out on different carbon
content steels before butt weld joints were made. The joints were subjected to
tension and corrosion tests. The results showed that there.is a relation between the
preheating temperature and the carbon content of the steel of interest.~he~ showed
that preheating in the range of 100-150°C improved the tensile strength of the tested
steel of carbon content of 0.6, 0.9 and 1.55 wt.%.,Little improvement of ductility has
been noted. Also, the results showed that, little effect for preheat on the comosion
resistance.

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