EXPERIMENTAL AND ANALYTICAL STUDIES FOR PREVENTION OF GALVANIZING CRACKS DURING HOT DIP GALVANIZING OF STEEL STRUCTURES

Abstract

Although hot dip galvanizing is a method of giving long-term corrosion protection to steel structures, steel materials may suffer cracks and/or distortion during hot dip galvanizing due to abrupt changes in temperature. As measures against cracks, beam-to-column welded connection with non-scallop methods having draining holes may be applied. However, there are some cases that cracks occurred in spite of taking such measures.
Therefore, in this study, we carry out immersion tests into molten zinc using specimens which changed the diameter and the position of draining holes for the partial model that assumed beam-to-column welded connection. Furthermore, the diameter and the position of draining holes can reduce possibility of cracks are examined by using the three-dimensional thermal conductivity and elastic- plasticity thermal stress analysis.