Final answer:
The longitudinal weld joint factor, Ej, for API 5L ERW (electric resistance welded) pipe is a numerical factor used in the design of welded pipes to account for the reduction in strength caused by the presence of longitudinal welds. the effective yield strength for design purposes would be 60,000 psi * 0.9 = 54,000 psi.
Step-by-step explanation:
The longitudinal weld joint factor, Ej, for API 5L ERW (electric resistance welded) pipe is a numerical factor used in the design of welded pipes to account for the reduction in strength caused by the presence of longitudinal welds. It is a dimensionless factor that ranges from 0.6 to 1.0, depending on the quality of the weld and the pipe material.
For example, if the specified minimum yield strength of the pipe material is 60,000 psi and the value of Ej is 0.9, the effective yield strength for design purposes would be 60,000 psi * 0.9 = 54,000 psi. The factor Ej takes into consideration factors such as the welding process, the quality of the weld, and any inconsistencies or defects in the weld joint.