The ornamental design for a mobile pipeweldingdevice, as shown and described.
FIG. 1 is a top isometric projection view of a mobile pipe welding device showing our new design;
FIG. 2 is an underneath isometric projection view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a right side elevation view thereof;
FIG. 5 is a top elevation view thereof;
FIG. 6 is an underneath elevation view thereof;
FIG. 7 is a left side elevation view thereof; and,
FIG. 8 is a rear elevation view thereof.
The nature of the design is a device through which a combined drive and idle wheel engages on the edges of a circumferential metal guide band attached to a pipe of any diameter which is positioned to be butt welded to another pipe of identical diameter. In use the embodiment of the ornamental design traverses around the edge of the aforesaid circumferential metal guide band in order to butt weld the adjacent ends of the two pipes.