Bending of Cold Worked Mild Steel Due to Different Welding Processes Josh Kelly and Matt Lewis ENGR 45 SRJC Fall ‘05

Preparation & Material Used Tinius Olsen Tensile Machine Tinius Olsen Tensile Machine Cold Worked Mild Steel 3/8 x 3 x 6 in. Cold Worked Mild Steel 3/8 x 3 x 6 in.

Welding Processes Arc Arc MIG MIG Dual Shield Dual Shield

Arc Welding E-7024 Rod E-7024 Rod 135 Amps 135 Amps 70,000 lb Tensile Material ESI 70,000 lb Tensile Material ESI

MIG Metal inert gas (MIG) 25% CO 2 75% Argon Gas Metal inert gas (MIG) 25% CO 2 75% Argon Gas wire, 70 volts, 140 amps DC wire, 70 volts, 140 amps DC+ 70,000 lb Tensile Material ESI 70,000 lb Tensile Material ESI

Self-shielded Flux-Cored Arc- Welding (Dual Shield) Wire, 23 volts, 175 Amps DC Wire, 23 volts, 175 Amps DC+ 70,000 lb Tensile Material ESI 70,000 lb Tensile Material ESI

Flexural Strength vs. Deflection Flex. Strength = 3 * Force * Length 2 * Width * height 2 Heat 400 Degrees F for 2.5 hours Heat 400 Degrees F for 2.5 hours

Flexural Strength vs. Deflection Flex. Strength = 3 * Force * Length 2 * Width * height 2 Focus on elastic region

Flexural Strength vs. Deflection Heating To Relieve Stress

Flexural Strength vs. Deflection Heating To Relieve Stress-Arc Welding

Flexural Strength vs. Deflection Heating To Relieve Stress-Dual Shield Welding

Flexural Strength vs. Deflection Heating To Relieve Stress-MIG Welding

Conclusions Stress relief affected samples differently Stress relief affected samples differently Hardness not a factor since all same material Hardness not a factor since all same material Flexural strength did not change due to the type of weld used on sample Flexural strength did not change due to the type of weld used on sample

References