I often use intermittent welds for structural purposes, too.
From my Exceptions:
-FOR INTERMITTENT WELDS, LENGTH SHALL NOT BE LESS THAN THE GREATER OF 4 TIMES THE WELD SIZE OR 40MM (1-1/2”). FOR COMPRESSION MEMBERS, THE MAX CLEAR SPACING BETWEEN WELDS SHALL NOT EXCEED 12”. FOR TENSION MEMBERS, THE MAX CLEAR SPACING BETWEEN WELDS SHALL NOT EXCEED 18” (CSA W59 11.4.13.2).