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I have a question about how some of my welds are turning out. I run a mig cp-300 at work and all my long strait welds are turning out this way. Is this normal??? I have not been welding long just a couple of years. Most welds made where i work are really flat and smooth. At the end of my welds there is a divot. is this normal??? I have copied a picture because my camera is not wanting to cooperate at the moment. my settings are 30-32 volts and wire is 75. any help to lessen this occurrence is greatly appreciated. Thanks in advance. will try to put an actual photo of my weld on later when the smarter than me camera decides to work. The part of the weld is on the right end of this weld. looks similar to what i am talking about. i have tried pushing, dragging, more angle less angle all the same results. I know this is alum and not the same metal but looks the same. Attached Images
Reply:That's pretty typical for aluminum MIG, you need to dwell a little longer at the end of your weld to fill that in.Have we all gone mad?
Reply:After you stop wait a second and just tap the trigger again untill it fills, but make sure you dont let the weld cool too much or it wont burn in properly.
Reply:Yes, this will happen, especially with thinner metals or metals with lower heat capacity. What is happening is the metal gets hotter and hotter as you keep welding, and at the end it is so hot that you've started to burn through the metal. There are three options. You could try going down a setting in voltage (only if the next setting is suitable to your project). You may be hitting your welds too quickly; take longer breaks between welds so the metal has time to cool off. Or, you could just fill in the divot at the end, as has been previously stated.
Reply:ok here a piece of practice material. camera finally uploaded. settings are 24 volts (indicator is sketchy), 35 wire speed, pure argon. now let also say that most of the welders that work with me are welding at 35 to 38 volts with wire speed maxed or at 75. that is the way they do it. this stuff that i weld is 1/8" or less. you have to weld really fast or you don't get the parts out. yes it is production welding. so here is the picture. i need to correct this divot. will use all advice and thanks. sorry about the glare but it is an old camera. wife would not let me borrow the good one. Attached Images
Reply:Originally Posted by mosley938ok here a piece of practice material. camera finally uploaded. settings are 24 volts (indicator is sketchy), 35 wire speed, pure argon. now let also say that most of the welders that work with me are welding at 35 to 38 volts with wire speed maxed or at 75. that is the way they do it. this stuff that i weld is 1/8" or less. you have to weld really fast or you don't get the parts out. yes it is production welding. so here is the picture. i need to correct this divot. will use all advice and thanks. sorry about the glare but it is an old camera. wife would not let me borrow the good one.
Reply:the machines are mostly miller with a separate feeder on top. the wire is .035. the wire control goes from 0-100 in 10's. i'll try to find a pic of it. the steel is some sort of stainless. as far as the argon goes only use mixed gas on one app. all others are strait argon in huge tanks outside. should be pure argon or that is what i was told. everyone uses same gas.
Reply:You have been told wrong. Never use pure argon for MIG welding any thing except aluminum. You either need to hook up an argon mixture cylinder or a mixer so that you can blend the argon from the outside tank.
Reply:Originally Posted by Pro-FabYou have been told wrong. Never use pure argon for MIG welding any thing except aluminum. You either need to hook up an argon mixture cylinder or a mixer so that you can blend the argon from the outside tank. |
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发表于 2021-9-1 00:17:30