If you leave a big crater at the end of your aluminum welds it leads to Cold Cracking that will spread. To fix it you want to make sure you change your work angle and sit to make sure it fills up. If you are having issues with welding aluminum with a spool gun check out @whiteriverrambo breaking down common issues over on YouTube. https://youtu.be/CMPB0vQG1_w | Weld.com

What are the factors that cause hot cracking in your welds and how can you avoid this problem? Proper dilution of the base material and filler metal is one important step to help prevent hot cracking. Watch the video to learn more. | Miller Welders