By -
Date 04-23-2005 01:30
Mr. Roberts,
I do not want to get into a "war of words", but in your previous response you specifically mentioned allowing the highest preheat temperature to avoid , or reduce, distortion of the 309. In fact, the preheat, which is not even recommended, would be for the base material (304), not the filler metal (309). When we are speaking of "generalities" we must distiguish between, in this case, stainless and carbon steels. This author was concerned with stainless and nickel alloys, not carbon steels. I thought, maybe I was not clear, that I was referring to heat input and interpass temperatures as two seperate intities. I understand what you're saying about putting the same size weld bead on a base metal, but it is unlikely that using 75 Amps to deposit a weld bead will be the same travel speed if you are using 100 amps. The lower amps requires a slower travel speed normally. I did not intend to say that 100 amps is high for welding stainless steel. For a 3/32" diameter stainless steel welding rod, regardless of the alloy, I would consider that a high amperage. But, for a 5/32" diameter stainless welding rod, regardless of the alloy, I would consider that a low amperage. I was merely using the 1/8" diameter as an example. Naturally, the amperage is going to be dependent on the welding rod diameter and the thickness of the part being welded. At some point, if needed, I would gladly share with you a paper presented at the latest NACE (National Association of Corrosion Engineers) in which I am a Member in Good Standings, regarding this very subject we are discussing. It ties directly into the paper being presented at the AWS conference next week about avoiding preheating stainless steels. Unfortunately, the "principals of distortion" do not allpy to stainless steels as they do to carbon steels. As I said earlier, I appreciate, as do all our readers, the comments and recommendations we all post on these forums. Discussions such as you and I are having only better educate the persons that do not deal in stainless steel as much as we do. Personally, as a Welding Engineer, I have specialized in stainless steel and the welding of stainless steel for over 30 years. I do not mean to imply that I know it all, I don't, but I can provide documented data to back up every comment I make on these forums.
My trip to the welding show will be a short one since I live in Dallas anyway. I would be happy to communicate with you outside of this forum if you so desire. I have a lot of data pertaining to stainless steel in my library is you want more information. Again, thank you for your comments.
Chuck
Mr. Roberts,
First of all, let me say how much I enjoyed our communication over the past couple of days. Also let me say that if I ever said or indicated anything less than with the most respect and gratitude, I sincerely apologize. I truly mean that. If mentioning that I'm a Welding Engineer (that is not my job title, but my chosen field) or that I belong to NACE, or am presenting a paper at AWS, if any of that offended you or made you feel uncomfortable, I also apologize for that, too. Personally, I enjoy getting to know the people in these forums, their background, their experience, chosen fields, etc. This is not to try to judge them, but to get to know them and make these forums a little more personal. If that is wrong, so be it. Apparently MBSims feels that a warning flag should be thrown up when people share this information, so I will be very careful not to share things like that in the future. I'm sure that there are some that share his feelings, but I'm sure there are those that do not. However, the purpose of these forums are to share information, whether it is on a personal basis or strictly recommendation-wise. Not all of these forums are going to please everyone, and that is the beauty of this scenario. Sharing... Again, if I, even in the slightest, offended or said anything to offend you, I'm sorry. I hope we can continue to share our thoughts even if they don't always go hand-in-hand with each other.
Chuck