welding-alloys.com 11 Test No. 2 clearly shows that cored wire improves productivity by reducing the time required to complete the repair. Fewer weld beads are needed. Test No. 3 also demonstrates increased productivity, with the faster travel speed helping to reduce heat input and limit the heat-affected zone. Compared to solid wire, cored wire: • Increases deposition rate and productivity by 35–65%. • Reduces dilution by 25%. Welding Coupon No. 1 No. 2 No. 3 Wire type and diameter (mm) Solid Ø 3.2 Cored Ø 3.2 Cored Ø 3.2 Voltage (V) 30 Wire feed speed (m/min) 1.5 2.9 2.9 Travel speed (cm/min) 50 50 70 Contact tip to work distance (mm) 30 Current (A) 400 Heat input (kJ/cm) 14.4 14.4 10.3 Deposition rate (kg/h) 6.0 8.2 8.2 Macrographs Number of passes 16 12 16 Productivity gains in submerged arc welding with cored wire To demonstrate these benefits, test coupons were welded to simulate gauge corner restoration. Test No. 1: Solid wire Test No. 2: Cored wire (with higher wire feed speed) Test No. 3: Cored wire (with higher wire feed speed and travel speed) Back to contents page
RkJQdWJsaXNoZXIy Mjk4MDU2NA==