Creep Deformation and Rupture Behavior of P92 Steel Weld Joint Fabricated by NG-TIG Welding Process

Low-cost weld joint on wear-resist gear train component was introduced for replacing conventional bolted connection to avoid its additional material and holes requirement. This study was concerned on the hardness analysis of carburized steel weld joint generated from SMAW with different welding currents, namely 80, 100, and 120 A. The results indicated that the hardness is decreased at HAZ and subsequently increased at weld metal for all samples. On the other hand, the highest welding current applied during welding shows the highest hardness curve among the other currents up to 226.5±2 HV at weld metal. By micro-and macrostructural analyses, phases evolution during thermal cycle on welding process played the crucial role to determine the hardness of HAZ, while the weld metal hardness was dominantly driven by the carbon-rich element distribution.

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An assessment of mechanical properties of P92 steel weld joint and simulated heat affected zones by ball indentation technique

Materials at High Temperatures ◽

10.1080/09603409.2017.1371913 ◽

2017 ◽

Vol 35 (5) ◽

pp. 427-437

Author(s):

Dipika R. Barbadikar ◽

T. Sakthivel ◽

A. R. Ballal ◽

D. R. Peshwe ◽

P. Syamala Rao ◽

...

Keyword(s):

Mechanical Properties ◽

Weld Joint ◽

Steel Weld ◽

P92 Steel ◽

Indentation Technique ◽

Ball Indentation ◽

Steel Weld Joint

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Effect of Underwater Welding in Marine Environment and Surface Welding to Mechanical Properties of Steel Weld Joint

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.862.308 ◽

2017 ◽

Vol 862 ◽

pp. 308-314

Author(s):

Herman Pratikno

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Marine Environment ◽

Weld Joint ◽

Welding Process ◽

Steel Weld ◽

Offshore Structure ◽

Underwater Welding ◽

Steel Weld Joint ◽

Surface Welding

The offshore structure gradually will get damage. A number of offshore structure maintenance method require underwater working. Because of that, underwater welding become an importance thing. Through this research,will be assessed on changes in mechanical properties of steel weld joint in marine environmental. With same weld parameter, welding process also do in freshwater and on land for comparisonvariable. Welding process do in 0.2m depth with SMAW wet welding method on 1G position using AWS E6013 electrode coated with wax. After doing research, it is found that the tensile strength of welds in the marine environment is a little larger than the tensile strength in freshwater and on land, ie 49.44 kgf/mm2> 49.41 kgf/mm2 > 48.99 kgf/mm2. Hardness index value of welded steel in the marine environment is also higher than the value of the weld hardness results in freshwater and on land, in the amount of 195.37Hv10>181.13Hv10>153.6Hv10. The value of tensile strength and hardness values in the marine environment welds slightly larger than in freshwater due to the amount of grain mertensit phase. Ductility properties of the weld results in the marine environmentis smaller than the weld results in freshwater and land, it is characterized by a decline inelongation and reduction of area in underwater welding. From the observation of metallographic microstructure underwater welding it appears that phase grains coarser than the microstructure of welding on land. This can happen because the weld metal suffered liquefaction then freezes so quickly that opportunity grain experiencing severe grain growth during thawing did not get transformed into finer grains, so that the material is harder but brittle.

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