Craft Edge

Hi - I am new to all this. I can't tell what checking the weld box in SCA does? I see that in CDS it will weld for me if I hit the "apply" button but this is not the case in SCA? Would appreciate some hints from you kind folks out there! Thanks!

Select the letters or images you want to weld, tick the weld button for each, then nudge them together (or move them together) the select Cutter - Preview to see how it looks when welded and before cutting.
Raewyn