Help a confused begginer

admin

Alright. All I know how to do (well at least) is braze with an A/O torch. I use my schools equipment. We have a torch, a stick welder, and what I believe to be a MIG welder (millermatic, I think 250). Any help is much appreciated. Ive tried a normal weld with the torch, but I always overburn the metals. I am familiar with the use of all three of the welders I have access to, but Im not exactly good at them. PLEASE HELP!!!
Reply:Tell me what machine you are using or if you ar oxyfuel welding then I can help. Also tell me the filler metal and base metal and I can set you up.
Reply:Im pretty much using an oxyfuel (acetylene) torch. Im working with what I think is steel, might be aluminum. Im using brass as a filler metal, if I choose to use a filler metal at all. Not looking to buy, just looking for tips.
Reply:If it is steel get you a welding tip. If you are brazing the question is do you pre place the flux or is it already on the rod? This is the tricky part. Make shure your peices are clean of mill scale. The set a tight gap between the peices. If you have flux to pre place then do it. The flux should be liquid in the range that the braze rod is. If the flux is in the rod then heat up the end of the rod to melt your flux. After your flux is active donot over heat the flux it will char and leave a bad weld. When the base metal is up to temp then touch the filler to the base. Then let capulary action take over. If you are not using flux heat up the portion you want to weld to the melting temp then add filler or give a slight swirrling motion of the tip as you progress forward. Hope this helps.
Reply:It does, thanks. I use flux on the rod. But im still having trouble making welds without filler (still using a torch). Any suggestions there would be much appreciated. Thanks in advance.
Reply:Use the swirling motion but do not ad filler.
Reply:Alright, that did it. Thanks a lot. I just have to work on not overmelting the metal until it falls away from my work. Ill get it with time I suppose. Thanks for all your help.
Reply:Originally Posted by WeldengineerIf it is steel get you a welding tip. If you are brazing the question is do you pre place the flux or is it already on the rod? This is the tricky part. Make shure your peices are clean of mill scale. The set a tight gap between the peices. If you have flux to pre place then do it. The flux should be liquid in the range that the braze rod is. If the flux is in the rod then heat up the end of the rod to melt your flux. After your flux is active donot over heat the flux it will char and leave a bad weld. When the base metal is up to temp then touch the filler to the base. Then let capulary action take over. If you are not using flux heat up the portion you want to weld to the melting temp then add filler or give a slight swirrling motion of the tip as you progress forward. Hope this helps.
Reply:The thing i was mearly explaining was how to weld steel with steel filler or without brazing the base metal does not get to the melting temp be fore the brazing filler does. The bond is more id a mechanical bond than a metalurgical bond.