The ornamental design for a weldingtorch handle, as shown and described.
FIG. 1 is a front perspective view of the design for a welding torch handle;
FIG. 2 is a right side view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a rear perspective view thereof.
In these drawings, the solid lines illustrate the claimed ornamental design, whereas the broken lines illustrate portions of the welding torch handle that form no part of the claimed design.