To create a welt, you [knit 1, slip 1 purlwise with yarn in front] all the way around. Here’s how to do it:
That’s how your first welt will look. When you change colors, you’ll be knitting 1 stitch in the new color, then slipping the next stitch purlwise with yarn in front. This means that every second stitch will appear in the first color for all but the last round of the welt, because you won’t be knitting these stitches.
Because you’re carrying the original color (in this case, blue) behind the new color (yellow), you’ll see the original color poking through the new color. In the third welt, in which you use the original color, you’ll see the second color poking through (in this case, yellow). You can see this in my sample.
Here’s what the inside of your cowl will look like after you work Welt Section 1.
That’s it for welts! Next week: the Twisted Loop Pattern.