The study of mechanical characteristics and metallurgical of metal welding dissimilar between A335 P11 and A312 TP304 stainless steels by using GTAW
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Abstract
The objective of this research is to study the mechanical properties and metallurgical structure of welded joints of A312 TP304 and A335 P11 steel for pipes size 2 inches, length 13 cm., thickness 5.54 mm., which is commonly used as fire tube steam for water tube boilers by gas tungsten arc method using filler metals Ni625/ER NiCrMo-3. RILON TIG 200A argon welding machine, welding current 95 V, welding speed 13.4 mm/min, shielding gas flow volume 15 liters/min. Perform mechanical property tests and metallurgical structures. The results of the experiment found that characteristics of deep penetration and melting between the weld metal and consistent metal work and there is perfection between the weld metal and the work metal. The width of the thermal influence zone of the welding process is similar and there are no defects in the welding line. The gas tungsten arc welding process will produce an average maximum tensile strength of 730 MPa and the highest hardness value is in the heat affected zone (HAZ P11) with an average maximum hardness of 209 HV. Impact tests have found that the average energy absorbed in the impact area Hot HAZ (A312 TP304) has better toughness than the HAZ (A335 Gr.P11) hot impact area and the welding area. Bending test results when bending to an angle of 180° and visual inspection did not reveal any cracks in all specimens. It can be concluded that the gas tungsten arc welding process of A335 P11 and A312 TP304 steel welds in all these workpieces was of satisfactory high quality which it is used in the selection of the welding process for the most usability efficiently.
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