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Picture for Important Factors in Pipe Butt Welding of Super Duplex Stainless Steel (SDSS) UNS S32760 Using the GTAW Welding Process
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Important Factors in Pipe Butt Welding of Super Duplex Stainless Steel (SDSS) UNS S32760 Using the GTAW Welding Process

Product Number: MPWT19-14287
Author: Dr. Glenn Byrne
Publication Date: 2019
$0.00

The paper considers best practice to realise the optimum combination of strength, toughness,
corrosion resistance and radiographic integrity in UNS S32760 pipe girth welds made using the
GTAW process.
Aspects of fit up, tacking, root gap are considered. The effect of weld heat input and heat input
control through the thickness of the joint, welding technique, inter pass temperature control and
the use of different combinations of shielding and backing gasses on corrosion resistance of
joints is presented. Current specification, procedure and welder qualification requirements are
discussed, as is the need for supplementary testing, in particular quantitative microstructural
evaluation.
Picture for Influence of Repeated Welding Thermal Cycle on The Mechanical Properties of SA516 Steel Weldment
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Influence of Repeated Welding Thermal Cycle on The Mechanical Properties of SA516 Steel Weldment

Product Number: MPWT19-14345
Author: Sandeep Kumar, Abdulla Ali Juma
$0.00

This study investigates the influence of thermal cycle as a result of repeated welding heat input on the mechanical and microstructural properties of the SA516 Gr 65 steel plates weldment in as-welded condition. The test specimens used were having an identical joint design, welded with submerged arc welding (SAW) process. Three different heat inputs of 0.96kJ/mm (low heat input), 1.5kJ/mm (medium heat input) and 3.58 kJ/mm (high heat input) were used for welding three individual specimens. All weld longitudinal tensile testing, Charpy V-notch impact test and weld metal & heat affected zone (HAZ) microstructural testing were done. The work shows that low heat input (LHI) produced welds with highest yield, tensile strength and toughness in the weld metal whereas high heat input (HHI) resulted in decrease in yield, tensile strength and toughness in the weld metal. Increased level of acicular ferrite and a fine grain structure in weldment were achieved with LHI, while the HHI produced coarse grain structure in the weldment and in the HAZ.
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