What are the actual differences in welding joint coefficients?
Thread Content
What is the actual difference in the welding joint coefficient? What’s the difference between 0.85 and 1? In actual production, it seems like there’s no difference, but how should this be understood? It’s said that it represents a reduction in strength, but that’s not easy to grasp. What do you all think? Is it possible to simply choose 0.85 for 20% radiation exposure and 1 for 100% radiation exposure?
The choice of welding joint affects the thickness of the equipment. The reduced security of detection must be compensated for by the security of thickness
The welding joint coefficient has been explained very clearly. Values of 0.85–≥20% for radiation, and 1–100% for radiation are not chosen arbitrarily; for example, when the equipment must not allow any leakage of media, a welding joint coefficient of 1.0 should be used ； When designed in accordance with the JB4732 standard, the welding joint coefficient is set at 1.0, etc.; therefore, the selection of the welding joint coefficient depends on factors such as design conditions and materials
Double-sided welded butt joints and fully penetrative butt joints equivalent to double-sided welding: 100% non-destructive testing, φ=1.00; partial non-destructive testing, φ=0.85. Single-sided welded butt joints (with gussets in close contact with the base metal along the entire length of the weld root): 100% non-destructive testing, φ=0.9; partial non-destructive testing, φ=0.8