D.H. Lammlein PhD Dissertation - Vanderbilt University

Figure 108: Lateral macrosections for full-penetration, supported welds made with the
cupped shoulder, threaded probe tool. Samples are taken from the steady-state portion
of each weld. Bose's reagent was used for etching.
Additionally, a matrix of 6 welds was performed at parameters identical to the full
penetration experiment at 50% material penetration and without interior support to the
material. A shoulder-less, 100°conical tool with a snub nose (Ø 0.025”) and
hemispherical cup indentation (Ø 0.015”) was used. Welds were performed using the
desired torque weld control method described above to maintain the desired depth
throughout the weld process. Lateral macrosections for this portion of the experiment are
shown in Figure 109.
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