The ornamental design for a portable weldingclampattachmentdevice, as shown.
FIG. 1 is a left perspective view of a portable welding clamp attachment device showing my new design.
FIG. 2 is a right side view thereof.
FIG. 3 is a left side view thereof.
FIG. 4 is a top view thereof.
FIG. 5 is a bottom view thereof.
FIG. 6 is a front view thereof.
FIG. 7 is a rear view thereof; and,
FIG. 8 is a right perspective view thereof.
The claimed portable welding clamp attachment device is primarily used to provide a portable device to attach a welding ground clamp or workpiece clamp.