非常感谢Yong.Jing老师，比我之前搜到的资料都要详细全面得多。
简单总结一下老师提供的资料，
根据下图可以看出这两种锯齿形焊接很相似，
另，根据以下内容可以看出
这一种可以指出靠近箭头的那一侧开始进行焊接（图中焊接符号指焊接由非箭头处开始）。
Mistake No. 8: Staggered Intermittent Welds
There are a few different types of intermittent welds: intermittent, chain intermittent, and staggered intermittent. Chain and staggered intermittent welds occur when intermittent welds are located on both sides of the joint. There is often confusion when people first encounter a pair of fillet or edge weld symbols offset on a reference line. Well, this offset is what sets a chain intermittent weld apart from a staggered intermittent weld. You see, the offset is meant to mimic the pattern that a staggered intermittent weld forms on a joint. Now, which side of the joint begins with a weld and which begins with an unwelded gap? Well, the offset squelches that concern as well. The side of the reference line that has the weld symbol closest to the arrow is the side that begins with a weld bead while the other side begins with a gap.
