Evaluation of Microstructural and Mechanical Behavior of AHSS CP780 Steel Welded by GMAW-Pulsed and GMAW-Pulsed-Brazing Processes

Abstract

Joints of complex phase 780 (CP-780) advanced high strength steel (AHSS) were carried out by using an ER-CuAl-A2 filler metal for the gas metal arc welding pulsed brazing (GMAW-P- brazing) process and the ER-80S-D2 for the GMAW-P process employing two levels of heat input. The phases in the weld bead and HAZ were analyzed, and the evaporation of zinc by means of scanning electron microscopy (SEM) was also monitored. The mechanical properties of the welded joints were evaluated by tension, microhardness and vertical impact tests. It was found that there was greater surface Zn evaporation in the joints welded with the GMAW-P process as compared to the GMAW-P-brazing process. The best results in tensile strength were observed in the joints welded with GMAW-P-brazing process, which increased by ~68% with respect to those of the GMAW-P. This behavior can be attributed to the formation of an intermetallic complex compound Cu-Al-Fe in the fusion line.

Nanoscale Tribological Properties of Nanostructure Fe3Al and (Fe,Ti)3Al Compounds Fabricated by Spark Plasma Sintering Method

“…In this test, the residual depth is an appropriate criterion for evaluating the wear resistance of the material. This test is frequently used to compare the wear resistance of various materials processed in different conditions [55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72][73]. The AFM images from longitudinal scratches of the bulk As can be seen, the residual depth of the Fe 3 Al compound is larger than that of the (Fe,Ti) 3 Al sample.…”

Impact of Welding Parameters in the Porosity of a Dissimilar Welded Lap Joint of CP800-XPF1000 Steel Weldment by GMAW-P

“…In the case of the interface WM-XP1000, the hardness is 238-270 HV100 and can be associated with the high concentration of Widmanstätten ferrite, which grows from ferritic grains with the precipitation of lamellar cementite. The microhardness is influenced by the microstructure and is dependent on welding parameters such as current and voltage, which play an important role in the heat input supplied [29,30]. Based on the results, it can be observed that the use of a suitable experimental arrangement allows better conditions to be obtained, such as the decrease in porosities as well as their diameter, e.g., in the case of trial 1.…”

“…In the case of the interface WM-XP1000, the hardness is 238-270 HV 100 and can be associated with the high concentration of Widmanstätten ferrite, which grows from ferritic grains with the precipitation of lamellar cementite. The microhardness is influenced by the microstructure and is dependent on welding parameters such as current and voltage, which play an important role in the heat input supplied [29,30].…”