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For the past two weeks I attended a dual shield flux core welding class at the Hobart Institute of Welding Technology in Troy Ohio. It was the sixth Hobart class that I attended. Hobart has two basic welding class series: Structural, which is five months long and Pipe, which includes structural and is ten months long. Most of the students take the pipe class. The first shift class, which I attended was from 8 till 4, with one hour off for lunch. The first week we welded 3/8 plate and the second week we welded 1 plate. There was one written test each week and every different position of weld was tested. In my case all of my welds were tested with a bend test. If I had been enrolled in the entire series, they would have tested my 1 horizontal and overhead welds by a CWI and an Xray test. The students that passed the CWI and Xray tests (which was most of the class) received a AWS certification. I could have paid extra for the additional testing, but for $350 I chose not to. To pass the course you have to pass all of the written and weld tests. Every few weeks they start another group of students, so at any time they are actually conducting most if not all of the classes. This means that a student like me can take any class at pretty much any time. I took my first class in 2008 and every few years I took another class. I actually scheduled this class two years ago, while I was still working, but it was canceled due to Covid. The two-year delay was due to my stent and hernia operations. I really enjoyed the class, but I should point out that I was the slowest student in the class in terms of getting welds done. I was also the oldest student in the class.I just did a very slight weave for the root pass1. Horizontal root
As directed, I did all stringer beads for all of the horizontal welds.2. Horizontal cover
3. Cutting test samples
4. Horizontal weld tested
I did a single weave pass for the first vertical fill pass. Some people did two beads instead.5. Vertical first fill pass
Smith Oxyacetylene TorchMiller Dynasty 200DXLincoln SP-250 MIG WelderClausing/Coldchester 15" Lathe16" DuAll Saw15" Drill Press7" x 9" Swivel Head Horizontal Band Saw20 Ton Arbor Press BridgeportLincoln LE 31 MP & Lincoln 210 MP
Reply:I did a single weave pass for the cover. They told us that keep weave passes below one inch.6. Vertical cover
7. Vertical test samples
8. Overhead cover
The sample passed even with the cracks, because the cracks didnt occur on the weld. The fact that I quenched the sample before I ran the cover pass, might have contributed to the cracks. It is ok to quench practice welds, but it is a bad practice to quench test welds. My bad.9. Overhead test samples
10. Overhead root
Smith Oxyacetylene TorchMiller Dynasty 200DXLincoln SP-250 MIG WelderClausing/Coldchester 15" Lathe16" DuAll Saw15" Drill Press7" x 9" Swivel Head Horizontal Band Saw20 Ton Arbor Press BridgeportLincoln LE 31 MP & Lincoln 210 MP
Reply:I chose to use multiple weave passes for each fill level. 11. Overhead fill pass
12. Overhead cover
For the one-inch-thick plates we cut 3/8 strips and side bent them. If you look closely, you can see the weld profile in the test sample.13. Overhead test samples
14. First fill pass
15. Fill pass
Smith Oxyacetylene TorchMiller Dynasty 200DXLincoln SP-250 MIG WelderClausing/Coldchester 15" Lathe16" DuAll Saw15" Drill Press7" x 9" Swivel Head Horizontal Band Saw20 Ton Arbor Press BridgeportLincoln LE 31 MP & Lincoln 210 MP
Reply:16. cover pass
If I had run straight stringer beads it would have taken ~21 passes. I used narrow weave beads instead.17. Run on tab
18. Vertical test samples
Smith Oxyacetylene TorchMiller Dynasty 200DXLincoln SP-250 MIG WelderClausing/Coldchester 15" Lathe16" DuAll Saw15" Drill Press7" x 9" Swivel Head Horizontal Band Saw20 Ton Arbor Press BridgeportLincoln LE 31 MP & Lincoln 210 MP
Reply:I used dual shield flux core for over 20 years. Great welding wire. Dave
Originally Posted by Don52
For the past two weeks I attended a dual shield flux core welding class at the Hobart Institute of Welding Technology in Troy Ohio. It was the sixth Hobart class that I attended. Hobart has two basic welding class series: Structural, which is five months long and Pipe, which includes structural and is ten months long. Most of the students take the pipe class. The first shift class, which I attended was from 8 till 4, with one hour off for lunch. The first week we welded 3/8 plate and the second week we welded 1 plate. There was one written test each week and every different position of weld was tested. In my case all of my welds were tested with a bend test. If I had been enrolled in the entire series, they would have tested my 1 horizontal and overhead welds by a CWI and an Xray test. The students that passed the CWI and Xray tests (which was most of the class) received a AWS certification. I could have paid extra for the additional testing, but for $350 I chose not to. To pass the course you have to pass all of the written and weld tests. Every few weeks they start another group of students, so at any time they are actually conducting most if not all of the classes. This means that a student like me can take any class at pretty much any time. I took my first class in 2008 and every few years I took another class. I actually scheduled this class two years ago, while I was still working, but it was canceled due to Covid. The two-year delay was due to my stent and hernia operations. I really enjoyed the class, but I should point out that I was the slowest student in the class in terms of getting welds done. I was also the oldest student in the class.I just did a very slight weave for the root pass1. Horizontal root
As directed, I did all stringer beads for all of the horizontal welds.2. Horizontal cover
3. Cutting test samples
4. Horizontal weld tested
I did a single weave pass for the first vertical fill pass. Some people did two beads instead.5. Vertical first fill pass
Reply:What did you grind with? |
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发表于 2021-10-11 15:51:28