Been welding panels now for a long time and found that butt welding was not always the easiest thing to do.. making you patch to fit into a hole,trimming it to fit then have it move around on you as you weld it. clamping it and have it move in the clamps.. well this is what I came up with. Now I say it has been done before but I dont see it alot so I figure I do a post on how I do butt welds that I find so easy and fast.. Well here is a hole I cut out of my quarter that was metal that was not going my way after shrinking it one too many times.. lol Now I like to reuse metal.I do this so as to get the same metal thinkness and besides it was free!! here you can see the size of the hole Im going to patch Nothing fancy I just clamped the panel right over the top of the hold and over lapped the panel. Now that i was happy with the fit I just cleaned the edges and tack the panel on the car.did not tack the corners as this is where Ill start. I tack it in place as so that it wont move as I cut and weld. Ill cut those weld when I come to them. Now no fancy tools. I just use my 4 inch grinder with a thin zip wheel. I played around with this and found if you use the patch as your guide and cut into the quarter on a 45 dregree angle the panels tend to fit tighter. Now i start in a corner and make two 2 inch cuts. here you can see the cuts Now all I did then was pushed the corner in till it was flush with the car and tacked in place Now that the corner is welded i cut about 4 inch of the panel along the top.. I only go four inchs cause the panel will fall past where you want it and you then have to push back on the panel. Here you can see how the panel is falling into the car. I stop here ,tack it in place and then move on another 4 inch. Now just keep cutting ever 4 inchs and tack till your all the way around the panel. Now before you start welding it up remove the old cut panel from the back side.I find it may have a few tacks holding it in place but they seem to brake very easy for the most part. As you can see the fit is good and ready to be fully welded. here it is all welded and grind down this works great on crown panels.what I like is by over lapping it this way the panel your installing stays tight on the car and cant move. also Im find that the time spend doing this is way less then cutting and fitting and the finsh fit is always better.