Fracture response of 1422-mm diameter pipe with double-V groove weld joints and circumferential crack in fusion line

Microstructural analysis and microhardness measurement of experimental repair weld joints were carried out in heat affected zone (HAZ) of the base material (BM) – steel 15Ch2NMFA after weld deposition of several layers by welding metal of Inconel FM 52. A temper bead welding (TBW) technique was used. Required microhardness up to 350 HV0.1 in heat affected zone of base material in distance 0.5 mm from fusion line was exceeded in all three experimental blocks with various welding energy inputs during deposition of three or five weld layers. Metallography showed reaustenitization and structure transformation in HAZ after the deposit of first layer in all three blocks. After deposit of the last layer the structure of HAZ in two blocks was tempered only and one variant of them have been recommended for futher technological tests. Structure of HAZ of the third block was not full tempered even after the last layer deposit.

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Temperature relationships of the mechanical properties of the base metal and weld joints of large-diameter pipe

Strength of Materials ◽

10.1007/bf01524783 ◽

1983 ◽

Vol 15 (6) ◽

pp. 867-871

Author(s):

G. I. Saidov ◽

A. N. Monoshkov ◽

Yu. I. Pashkov ◽

A. A. Ostsemin

Keyword(s):

Mechanical Properties ◽

Base Metal ◽

Large Diameter ◽

Weld Joints ◽

Large Diameter Pipe ◽

Diameter Pipe

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Study on the Failure Assessment of Small Diameter Pipe With Circumferential Crack Under Monotonic and Cyclic Multi-Axial Loading

Volume 6A: Materials and Fabrication ◽

10.1115/pvp2014-28386 ◽

2014 ◽

Author(s):

Masao Itatani ◽

Toshiyuki Saito ◽

Yoshiaki Akiniwa ◽

Keita Naito

Keyword(s):

Cyclic Loading ◽

Equivalent Stress ◽

Small Diameter ◽

Axial Loading ◽

Maximum Load ◽

Carbon Steels ◽

Specimen Thickness ◽

Loading Pattern ◽

Circumferential Crack ◽

Diameter Pipe

Failure behaviors of small diameter pipe of austenitic stainless and carbon steels with circumferential crack under monotonic and cyclic multi-axial loading were observed and the criteria of failure under these conditions were investigated. For the failure under monotonic loadings, it was observed that the maximum load was attained when the net section von Mises equivalent stress almost reached to the flow stress of the material. For the cyclic loading, Pa/Pmax or Ta/Tmax seems to be a good parameter to estimate failure life irrespective of specimen thickness, initial crack size and loading pattern, especially for STPT410. Here, Pa and Ta are load and torque amplitude respectively, and Pmax and Tmax are the maximum load and torque under monotonic loading with the same loading pattern for cyclic loading.

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OS1413 Effect of Loading Direction on Crack Growth Behavior near Fusion Line in Low Carbon Stainless Steel Weld Joints

The Proceedings of the Materials and Mechanics Conference ◽

10.1299/jsmemm.2009.35 ◽

2009 ◽

Vol 2009 (0) ◽

pp. 35-37 ◽

Cited By ~ 1

Author(s):

Taku ARAI ◽

Kenji KAKO ◽

Keiji WATANABE ◽

Yuichi MIYAHARA

Keyword(s):

Stainless Steel ◽

Crack Growth ◽

Growth Behavior ◽

Fusion Line ◽

Crack Growth Behavior ◽

Steel Weld ◽

Low Carbon ◽

Weld Joints ◽

Loading Direction ◽

Stainless Steel Weld

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Effects of bottom plate in friction stir welding of AA6061-T6

Metallurgical Research & Technology ◽

10.1051/metal/2020087 ◽

2020 ◽

Vol 118 (1) ◽

pp. 108

Author(s):

M.A. Vinayagamoorthi ◽

M. Prince ◽

S. Balasubramanian

Keyword(s):

Mechanical Properties ◽

Axial Load ◽

Weld Zone ◽

Welding Process ◽

Bottom Plate ◽

Welding Parameters ◽

Nugget Zone ◽

Friction Stir ◽

Weld Joints ◽

Fine Grain

The effects of 40 mm width bottom plates on the microstructural modifications and the mechanical properties of a 6 mm thick FSW AA6061-T6 joint have been investigated. The bottom plates are placed partially at the weld zone to absorb and dissipate heat during the welding process. An axial load of 5 to 7 kN, a rotational speed of 500 rpm, and a welding speed of 50 mm/min are employed as welding parameters. The size of the nugget zone (NZ) and heat-affected zone (HAZ) in the weld joints obtained from AISI 1040 steel bottom plate is more significant than that of weld joints obtained using copper bottom plate due to lower thermal conductivity of steel. Also, the weld joints obtained using copper bottom plate have fine grain microstructure due to the dynamic recrystallization. The friction stir welded joints obtained with copper bottom plate have exhibited higher ductility of 8.9% and higher tensile strength of 172 MPa as compared to the joints obtained using a steel bottom plate.

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