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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 SizeTensile Strength
[MPa]
Fracture Area
Width[mm]Thickness[mm]
124.948.3560Base Metal
225.147.5555Base Metal
*The tensile test for the welding joint of ASTM A335 P11 pipes.

Item No.Specimen Spec.(mm)Bending MethodD = 4aResult
1~447.5 x 10Side Bending180°OK
*The bending test for the welding joint of ASTM A335 P11 pipes.

Test No.V-Notch PositionTemperature [°C]Akv[J]
1Center of Seam1550/ 72/ 66
2Heat Affected Zone1587/ 112/ 120
*The impact test for the welding joint of ASTM A335 P11 pipes.

Test AreaHeat Treatment StatusHardness [HV]
Weld SeamAfter216224218205209
HAZAfter242218227232212
Base MetalAfter169173170165163
*The hardness test for the welding joint of ASTM A335 P11 pipes.

Microstructure of ASTM A335 P11 Pipes, Welding Seam & HAZ

The microstructure of ASTM A335 seamless pipes(base metal of the welding).

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.

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.

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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