What is claimed is the ornamental design for a welding jacket, as shown and described.
FIG. 1 is a front elevation view showing the welding jacket of Applicant's invention as it may appear if worn by a user.
FIG. 2 is a left side elevation view of the welding jacket of FIG. 1 as it may appear if worn by a user, both sides being identical; and,
FIG. 3 is a rear elevation view of the welding jacket of FIG. 1 as it may appear if worn by a user.
The broken lines throughout the figures define boundaries of the welding jacket, buttons, patches, sewn lines, and the like which are not part of the claimed design.