**1. Can you weld A36 to A572?**
Yes, you can successfully weld A36 steel to A572 steel. They are both carbon steels and have good weldability. The key is to use a filler metal that is compatible with both grades. Often, an electrode matching the strength of the stronger material (A572) is chosen, such as an E70XX electrode, and standard welding practices for carbon steel should be followed.
**2. Is A572 more expensive than A36?**
Generally, yes, A572 Grade 50 is typically more expensive than A36. This is because A572 Grade 50 has a higher minimum yield strength (50 ksi vs. 36 ksi), which is achieved through chemical composition control and often microalloying with elements like vanadium or columbium (niobium), increasing its production cost.
**3. Is A572 always grade 50?**
No, A572 is not always Grade 50. ASTM A572 standard specifies several different yield strength grades: 42, 50, 55, 60, and 65. However, Grade 50 is by far the most common and widely used grade specified in construction and other structural applications.
**4. What is the alternative to ASTM A572?**
A common and often preferable alternative is **ASTM A992**. This standard is specifically for wide-flange structural shapes (like I-beams) and is the modern standard for structural steel buildings in the US. It has similar strength to A572 Grade 50 but with stricter requirements on chemical composition to ensure better weldability and toughness.
**5. Can you bend A572 grade 50 steel?**
Yes, you can bend A572 Grade 50 steel. However, due to its higher strength compared to mild steel like A36, it requires more force to bend and has a larger minimum recommended bend radius to avoid cracking. The specific bend radius will depend on the thickness of the material and the direction of the bend relative to the grain.
