
Whenever I'm restarting midway through a weld, or tying two together, I like to grind the existing weld down a little. When starting on an existing weld I strike the arc a little ahead of where the actual weld begins and make sure that the arc is stable before beginnging the weld. It is also crucial to make sure that no slag is left from the previous weld.
Personally I prefer 6010 or 7018, but for 6013 (when I have to

I hope this makes sense, I tired and hungry, and waiting for dinner...

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