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Welding/tig welding 6063 & 6061

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Question
Hi i have a few questions Can you tig weld 6063 to 6061? And also i understand that 6061 is stronger than 6063 ? But I have read that 6061 gets weak when welded? So after welding which is stronger 6063 or 6061

Answer
It is a little more complicated.
6061 and 6063 are heat treatable alloys.
6061 is most commonly available in the T6 hardness.
6063 maxes out at about T4, and does have a lower tensile strength, but it is used for extrusions that need to be rolled into curves or press formed.

You can weld 6061 to 6063 just fine using 5356 or 4043 filler rods.
After welding the heat affected zone will be at a lower hardness. Usually it will be around T2 - T3.

Both alloys are precipitation hardening. This means that their hardness is affected by time and temperature.
T6 is "artificially age hardened", and can only be achieved using a complicated series of heat/time programs in an electronically controlled oven.

While the heat affected zone around the weld will be reduced to a T2 after welding, over the next few weeks the hardness will climb to a maximum of T5.
The only way to get 6061 back to a T6 is to heat treat the entire part.
However if you are welding 6063 to 6061, a T6 condition won't matter.

To answer your exact question, even after welding 6061 is still going to be stronger.

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Ernie Leimkuhler

Expertise

Questions about Oxy-Acetylene welding/cutting, MIG, TIG, Flux-core, Stick welding, brazing and soldering, bike frames, air frames, motorcycle frames, structural welding. Also questions about Welding Certifications and Inspections. All questions about fabrication of metals (stainless steel, steel , aluminum, brass, bronze, copper). Basic questions about underwater welding. TIG is my strongest subject.

Experience

Extensive background in most welding fields. 18 years fabrication of metal theatre scenery, 16 years structural steel, 2 years pipe welding, 9 years as a Welding Instructor at South Seattle Community College, and 5.5 years as a Welding Instructor at the Divers Institute of Technology. 16 years Industrial Welding Consultant for fabrication shops in the greater Seattle Area. 11 years Architectural Metal Fabrication. 8 years in Film/TV; SPFX/construction/set-deco/props/. 33 years Blacksmithing and Knifemaking. Currently a Field Welding Inspector for Otto Rosenau and Associates.

Organizations
American Welding Society - Certified Welding Inspector Washington Assoc of Building Officials (WABO) - Special Inspector - Structural and Reinforcing Steel.

Publications
Do a search on google groups for "Ernie Leimkuhler" in the rec.crafts.metalworking and sci.engr.joining.welding groups. http://www.stagesmith.com/ http://www.metalwebnews.com/ Blacksmith's Gazzette - Anvil Making

Education/Credentials
BA Theatre Technology - Purdue University.

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