"""MIG or "squirt-gun" welding grew in popularity over the past 15 years as shop owners were attracted by its quick training time and ease of use. The downside with MIG is the difficulty controlling MIG's high deposition rate with the electrode wire and the time required to grind down welds. Still, it remains the most popular aftermarket repair welding technique."""
Excerpt from online article
http://www.asashop.org/autoinc/march97/welding.htmI'm not saying it's 100% correct but it may help you.