January 30, 2017 | By Frank Armao
A reader wanting to make a repair to a 356.0-T6 aluminum cylinder gets Frank's advice on what filler metal to use.
November 30, 2016 | By Frank Armao
Q: My company recently purchased a piece of equipment fabricated from 6061-T6 structural shapes. The welds do not seem to be very good and we have found several cracked welds. However, it is the weld shown in the photo that is puzzling. This weld shows a crack in the 6061 base metal about 2 in....
September 23, 2016 | By Frank Armao
This month’s topic doesn’t deal specifically with welding aluminum, but I think you will agree it has important implications in the design and fabrication of aluminum structures. This topic and its associated problems have come up in conversations twice in the past two months. It deals with...
July 22, 2016 | By Frank Armao
Q: Lately I have seen a few welding equipment manufacturers offering gas metal arc welding (GMAW) power sources that use alternating current (AC) instead of the direct-current electrode-positive (DCEP) current. Can you tell me what, if any, advantages there are to using AC instead of the more...
May 12, 2016 | By Frank Armao
Q: I will be getting into aluminum welding much more than I have in the past. I want to buy a new set of equipment for gas metal arc welding (GMAW) and I’ve already picked out the power supply and feeder. Should I buy a push-pull gun or stick with the simpler and less expensive push-only gun? A:...
March 28, 2016 | By Frank Armao
Editor’s Note: Part I appeared in the January/February 2016 issue of Practical Welding Today®.
January 29, 2016 | By Frank Armao
Frank Armao explains why contact tips are important in the welding process and what you shouldn't do to remedy burnback problems.
November 16, 2015 | By Frank Armao
Q: I recently fabricated a large component from 1-in.-thick 5083 aluminum. The customer required it to be radiographed. His inspector failed one of the radiographs because of a lack of fusion (LOF) discontinuity. I looked at the radiograph and I can’t see any discontinuity. Could the inspector be...
September 28, 2015 | By Frank Armao
Q: I’m having quite a bit of trouble with porosity in my aluminum welds lately. Can you tell me the sort of measures I should take to minimize the porosity? A: Let’s first define the basic cause of weld porosity in aluminum and then go on to summarize the major causes. All porosity in...
July 23, 2015 | By Frank Armao
Rumor has it that fabricating aluminum and steel components in the same building can cause contamination in the aluminum. Is this true or is it just a myth? Frank Armao has the answer.
May 14, 2015 | By Sue Roberts
Production difficulties due to the complex design of a heat exchanger for ZELTIQ® Aesthetic Inc.’s CoolSculpting® equipment designed to selectively reduce fat caused the company to fall behind on shipments. A redesign by Electron Beam Engineering Inc., Anaheim, Calif., reduced the amount of 5052 aluminum needed by about 15 percent, simplified production for a 20 percent time savings, and upped quality to over 99 percent. The 15-in.-long electron beam welds are pressure-tight, narrow, and do not require postweld finishing.
May 12, 2015 | By Frank Armao
Q: Recently I bought a new high-end pulsing power supply, which has different modes for all of the common materials and wire diameters. I was getting great results with 3/64-in. 5356 wire and 100 percent argon shielding gas. When I changed to a mixture of 70 percent argon/30 percent helium, the arc...
May 1, 2015 | By Galen White
Don’t wait for defects to appear in your aluminum welds. Be proactive by understanding how to prevent them from happening in the first place.
March 16, 2015 | By Frank Armao
Q: I need to do a lot of welding on A356 aluminum castings. Can you tell me which filler alloy I should use? A: Alloy 356 and its variants (A356, B356, C356) is an aluminum-silicon-magnesium (AISiMg) alloy containing about 7 percent silicon and 0.35 percent magnesium. It is heat-treatable in the...
January 20, 2015 | By Frank Armao
Q: I bought some anodized 6061-T6 tubing to make a structural framework and I’m having trouble welding it. The welds are black and ugly. Can you help? A: I think I can help. First, it would be helpful to explain what anodizing is. Anodizing is a reverse plating operation of sorts in which the...