Microwave roasting of agglomerated flux for submerged-arc welding

Abstract

A microwave (MW) roasting experiment of agglomerated flux for submerged-arc welding was carried out. The MW heating characteristics of agglomerated flux and influence of roasting temperature on weld surface were investigated. It was found that the heating rate of agglomerated flux becomes faster with the increase of MW powder. It only takes 17 min to heat the sample of 600 g from room temperature to 720°C. A neat and smooth weld surface can be obtained for agglomerated flux roasted by MW heating at 680°C for 30 min. Compared with conventional roasting methods, MW roasting has the advantage of lower temperature and shorter time.

Keywords

• agglomerated flux
• microwave roasting
• submerged-arc welding