The Welding Process of ASTM A335 P11 Pipes 02
The welding qualification records(WQR) for ASTM A335 P11 seamless pipes shall be made in accordance with ASME Section IX and JB 4708. It covers tensile test, bending test, impact test and hardness test for the base metal, welding seam and heat affected zones. Meanwhile, the microstructure of base metal(A335 P11), weld seam, and heat affected zone shall be illustrated.
Tensile, Bending, Impact & Hardness Tests for Welding Joints of ASTM A335 P11
| Item No. | Specimen Size | Tensile Strength [MPa] | Fracture Area | |
| Width[mm] | Thickness[mm] | |||
| 1 | 24.9 | 48.3 | 560 | Base Metal |
| 2 | 25.1 | 47.5 | 555 | Base Metal |
| Item No. | Specimen Spec.(mm) | Bending Method | D = 4a | Result |
|---|---|---|---|---|
| 1~4 | 47.5 x 10 | Side Bending | 180° | OK |
| Test No. | V-Notch Position | Temperature [°C] | Akv[J] |
|---|---|---|---|
| 1 | Center of Seam | 15 | 50/ 72/ 66 |
| 2 | Heat Affected Zone | 15 | 87/ 112/ 120 |
| Test Area | Heat Treatment Status | Hardness [HV] | ||||
|---|---|---|---|---|---|---|
| Weld Seam | After | 216 | 224 | 218 | 205 | 209 |
| HAZ | After | 242 | 218 | 227 | 232 | 212 |
| Base Metal | After | 169 | 173 | 170 | 165 | 163 |
Microstructure of ASTM A335 P11 Pipes, Welding Seam & HAZ
The microstructure of ASTM A335 seamless pipes(base metal) which consists of ferrites and pearlites, as well as a small amount of granular bainites and carbides.
The microstructure of the welding seam of ASTM A335 P11 pipes which consists of pearlites, ferrites, granular bainites and some tiny granular carbides. Some coarse ferrites are distributed along the grain boundary in mesh-grid lattice.
The microstructure of heat affected zones in welding joints of ASTM A335 pipes which consists of granular bainites, ferrites, pearlites and small amount of carbides.
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