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I am a newcomer to this list and a beginner welder using an oxyacetylene outfit. My main difficulties are welding T joints on anything thicker than 1/4 (4inch X 1 ½ inch C channel). I was able to make a T joint using a 12 gauge steel sheet. To weld them I used a Smith 203 nozzle with 8 Psi for both Oxygen and Acetylene using 3/32 rod. Look at the first three pictures and please critique them. What am I doing wrong?The two new pictures are where my main difficulties are. I tried to weld T joins on two C channels with the already mentioned sizes. I used a Smith 209 nozzle with 10 Psi for both O\A with 1/8 rod. I tried to heat a base plate to create a puddle, but it seems there wasnt enough heat to do it. The base metal was light red hot when I started to add filler metal, it started to pop very loudly and to splatter in all directions. It looks like the base metal was very hot, but at the same time it didnt even melt. How do you weld this kind of joint? What nozzle, pressure and rod should be used with my Smith torch? Attached ImagesLast edited by ironcycler; 02-01-2006 at 11:46 PM.
Reply:I would use a nuetral flame and try cleaning the metal first.Also be sure to heat both peices the same and when doing a tee joint you must have the torch tip at 45 to the joints and about 15 degrees for travel angle try that it should help.Nobody moves nobody gets hurt(safety first)millematic passportmiller 375 plasmacutter
Reply:You're not hot enough to run the thicker material. Try putting the oxygen up to about 40 and go slow enough that you can get a puddle going like you did on the thinner stuff.
Reply:When using normal sized tips, 201-205, a good flame is quiet if not silent. When you get into the big tips, a silent flame is not moving fast enough. You need to open up the valves on your handle a lot more. Try to get the inner cone at least 1/4" long. I don't do much welding with my 209 tip, but I have sucessfully made a T weld of 1/8th inch box tubing to 1/4 inch plate. The T welds generally take a lot more heat than a but weld or corner weld.
Reply:Should the flame be quiet for O\A welding? I have tried to use a quiet flame at the beginning and it looked to me like it was not hot enough. All my flames are always rather loud, especially with a big nozzle (209). Is there any general recommendation on how to find out what flame is appropriate for the weld?I have just 203 and 209 Smith nozzles for now. Which one would be more appropriate to use for this kind of weld? I used 10 psi for both O\A and I thought it was maximum pressure for the medium duty Smith torch. Can I add more pressure to Oxy without busting the torch? I thought it was splattering because the filler metal was too hot. Is it possible I have too hot a flame? Will the splatters stop when I melt the base joint and start to dip the rod into the puddle? Is it correct or not?
Reply:I was saying your flame should be loud with the 209, the smaller tips are quiet. 10 psi is sufficient to work with the 209 tips. Try setting the inner cone to be abou 1/4 of an inch. I think the popping you are getting is because you are melting the filler before the base metal melts. There is little heat conduction between the molten filler and the base metal. All of the heat goes from the torch to the molten puddle of filler, causing it to boil and pop. Make sure a puddle has formed on the base metal before adding filler.
Reply:If you buy one more tip to do all of the welding you'll need to do, I recommend the 205. The 205 is usually the one that comes with the kit and is recommended for metal around 1/8th of an inch. I've sucessfully welded as thin as 16 guage and up to 3/16ths of an inch with the 205 tip. I use a 201 to cover everything between. I have welded as thin as 22 guage with the 201 and stopped at 16 guage because the 205 works better above.Your torch can handle a lot of pressure. When cutting, the typical oxygen pressure is 40 psi. I typicall set my gas pressures at 10 psi and 40 psi and make all of the adjustments for a neutral flame and the temperature of the flame at the handle. I do this so I can switch between welding and cutting without using the regulator. 10 psi is more than adequate to provide the flow you'll need to run those big tips.Last edited by 76GMC1500; 02-02-2006 at 01:09 PM.
Reply:Could you give me advice on the size and kind of rods? What rods do I need to have to cover most of steel welding?
Reply:Sure. I'm the kind of guy who can't afford to buy every accessory to go with my welder. Instead, I buy the ones that cover the widest range of applications and then push them a little above and below their range when necessary. Currently, I use RG 60 wire from Lincoln for my gas welding. I have wire in 1/16" and 3/32" which covers almost every application between 22 guage and 1/4 inch. The 1/8th would be best for 1/4 inch, but you can feed the 3/32 fast enough so it does work some as well. I own a 201, 205, 208, and 209 tip. I would like to get a 206 next because some of the brazing I do is a little big for the 205. To do stainless welding, I use 309L filler. It seems to be compatible with most of the 300 series stainless steels.
Reply:Perhaps you could run a few of those 1/4" T joints without using any filler rod for practice.You will get some undercutting but it will help with running the puddle.Turn up the heat and slow down and it'll flow.
Reply:The puddle doesn't run well on it's own without any filler. You can add some filler at the beggining and then run the rest of the weld without any.
Reply:I've done a lot of 3/16 and 1/4 T joints with my biggest Oxy Acetylene tip at the manufacturer's recommended pressures for welding (10 lbs each for my Airco torch). To generate enough heat, the torch is VERY loud, the cone is close to 1/2 inch long and the pressure tends to blow the puddle away until you get the torch angles right. Starting the puddle takes a lot of preheating, and you have to be patient. Also, with a T joint, you're usually working with a C-shaped puddle, as the metal where the work pieces meet does not melt as quickly as the surfaces slightly away from the joint. Your welds on the lighter stock look good. To practice on the heavier stuff, you need to accept a long preheat, the sometimes intimidating noise, and (until you get some practice) the worry that you're going to spray metal across the room.
Reply:Boy, you guys are scaring me with these pressures.The problem with the heavier coupons is not enough heat, toosmall a tip. With a Victor 315 I'd run at least a 5 tip maybe a 7 if I had one. Pressure Act 4-7 lbs Oxy maybe 10.David |
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发表于 2021-9-1 00:17:53