This study was carried out to select suitable welding methods and welding consumables used for constructing a galvanizing bath. In this report, these were selected in terms of the elevated temperature strength, the susceptibility of liquid metal embrittlement and corrosion resistance in liquid zinc.
The base metal used was a carbon steel specialized for a galvanizing bath. The shielded metal arc (SMA) and gas shield arc weldings (GMA) were used with a covered electrode (E1) and solid and flux cored wires (F1, F2 and F3).
The elevated temperature strength of all deposited metals were measured at the temperature range from room temperature to 600°C.
Moreover, the notched bar tensile (NBT) test, where the bottom of notch was coated by liquid zinc, was performed at the temperature of 480°C to know the susceptibility of liquid metal embrittlement. Corrosion resistance was measured at the temperature of 450°C in molten zinc of practical bath.
Strength at the elevated temperature of deposited metals by GMA welding was higher than that by SMA welding. The susceptibilities of liquid metal embrittlement of deposited metals became high in the order of E1, F3, F1 and F2. The susceptibilities of F1 and F3 were almost corresponded with that of the base metal. The susceptibility of liquid metal embrittlement at liquid zinc increased with an increase in the term of C+Si+Mn. Moreover, corrosion resistances of F1 and F2 in liquid zinc were higher than those of the base metal, E1 and F3. When the value of C+Si+Mn exceeds 1.7%, corrosion resistance of weld metal decreases.
The solid wire, F3 was. selected as a candidate of welding consumable used for constructing a galvanizing bath from the present results.
