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I am new at Mig welding. What is the proper procedure for Mig welding 1/8" metal to 1/4" metal without blowing a hole in the 1/8"?Thanks
Reply:what wire? what gas?ChuckASME Pressure Vessel welder
Reply:Assuming it's steel you're welding , I'd set the machine for 3/16" or 1/4" and concentrate the heat a little more on the thicker member . That's really a loaded question ,as there are many different joint configurations. If necessary, try back stepping the welds . and, weld the ends first , so you don't burn out when you get there .
Reply:The universal approach whatever the process is to establish the arc on the thick material and just wash the edge of the puddle onto the thin material. I have run 300 amps joining 3/8th material to 16 gauge sheet metal. In that case any more than just the edge of the puddle and the 16 gauge disappeared.
Reply:Originally Posted by lotechmanThe universal approach whatever the process is to establish the arc on the thick material and just wash the edge of the puddle onto the thin material. I have run 300 amps joining 3/8th material to 16 gauge sheet metal. In that case any more than just the edge of the puddle and the 16 gauge disappeared.
Reply:This story brings a smile to my face every time I think of it. The shift before I had finished my job and the foreman asked me if I would do a little weld test. He wanted me to weld a scrap piece of heavy angle to a 16 guage piece of scrap using a 3/16 diameter E 7024. I managed to sort of do it so I was recruited to building a beehive burner the next day. I imagine this was one of the last burners built since they are big polluters. There were at least four of us put out in this large building open at both ends. Before I arrived they had layed out the lines on the floor with soapstone and chalk line. Precut panels of 16 ga. cold finished steel were set on the concrete floor. We manually set two forty foot long four inch angle irons down on top on each side. The angles were 4 X4 and 3/8 thick. The idea was that four of us would quickly tack weld these panels to the angle's toe in a stitch pattern. E 7024 rod is very easy to strike. You can weld blind with the stuff. The rod was held at an angle of about 20 degrees to the horizontal directed at the toe of the angle. The weld pool would roll onto the 16 gauge and it was welded for the couple of inches. The welding power supply was a welding machine bank. It consisted of about twelve smaller units all tied together in a rack. These are common on large construction sites or shipyards. It was a first for me. We never thought much about it. We each had our own lead with stinger and we were going flat out tacking then calling in the mobile crane to take it out as we set up the next panel. four guys running 300 amps and only one ground lead created an intersting result. At first I thought that one of us had stepped on some hot slag ro something because the air was filled with that familiar burning rubber odour.
Reply:This story brings a smile to my face every time I think of it. The shift before I had finished my job and the foreman asked me if I would do a little weld test. He wanted me to weld a scrap piece of heavy angle to a 16 guage piece of scrap using a 3/16 diameter E 7024. I managed to sort of do it so I was recruited to building a beehive burner the next day. I imagine this was one of the last burners built since they are big polluters. There were at least four of us put out in this large building open at both ends. Before I arrived they had layed out the lines on the floor with soapstone and chalk line. Precut panels of 16 ga. cold finished steel were set on the concrete floor. We manually set two forty foot long four inch angle irons down on top on each side with cross pieces. The angles were 4 X4 and 3/8 thick. The idea was that four of us would quickly tack weld these panels to the angle's toe in a stitch pattern. E 7024 rod is very easy to strike. You can weld blind with the stuff. The rod was held at an angle of about 20 degrees to the horizontal directed at the toe of the angle. The weld pool would roll onto the 16 gauge and it was welded for the couple of inches. We used the same amperage to weld the angle frame together at the cross members. The welding power supply was a welding machine bank. It consisted of about twelve smaller units all tied together in a rack. These are common on large construction sites or shipyards. It was a first for me. We never thought much about it. We each had our own lead with stinger and we were going flat out tacking then calling in the mobile crane to take it out as we set up the next panel. Four guys running 300 amps and only one ground lead created an intersting result. At first I thought that one of us had stepped on some hot slag or something because the air was filled with that familiar burning rubber odour. 4 X300 = 1200 amps The ground lead had melted and the rubber had flowed onto the concrete in a two inch side band on each side of the ground lead. Quickly the lead hand pulled up the cable and hid it away from the foreman's eyes. We pulled out extra ground leads and continued as if nothing happened. If the foreman has seen that melted lead we would have all seen the road at end of shift.Last edited by lotechman; 04-16-2006 at 12:03 PM.
Reply:lol good one lotechIF it Catches...Let it Burn |
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发表于 2021-9-1 01:00:17