Welding on Hardened 8620 Tool Steel, any suggestions?

By Tigger1106 Date 04-26-2010 23:51

I may be joining an 8620 pinion gear to an 8620 shaft soon. Both pieces have been hardened, (case hardening) done to them. Does anyone have any suggestions on filler rod/ pre-heat or PWHT temps if necessary for this welding procedure? I have been researching all week, and many suggested 400 F for pre-heat, with slow post weld cooling. Rods suggested so far have included 312 SS, and Eutectic 680S, and 9018. I've also been told that this may have had a oil quench, and thus does not require a pre-heat/post heat process. I thought all tool steel should be pre-heated. Hm......I'm hoping to find out more on the heat treatments next week, but any advice in the meantime would be greatly appreciated. The application will be a temporary part to be used until a full billet part is produced. It is strictly for testing purposes right now. I plan on GTAW process, using ARgon shield, and grinding the case hardening off.

By ssbn727 (*****)

Date 04-27-2010 02:17

Hi Tigger1106!

First off, "WELDCOME TO THE WORLD'S GREATEST WELDING FORUM!!! :) :) :)"

Now, Here are some links to sites which may help you decide the best way to go with this material... Some of these links will give you information regarding weldability, pre-heat, interpass and PWHT suggestions... Also some of these links are to GTAW welding filler wire/rod manufacturers and suppliers who sell a filler wire suitable for 8620, and I recommend you read them all to see what each has to offer you when using theses different filler wires.

http://www.weldmold.com/index.php?option=com_content&view=article&id=29%3Aweld-mold-920-&catid=4%3Atool-steel&Itemid=13

http://www.scotforge.com/sf_qacarbonsteel.htm

http://metals.lincdigital.com.au/files/Product%20datasheets/Atlas8620H.pdf

http://www.corusnz.com/downloads/CaseHard_AISI8620.pdf

http://libertyalloys.com/mildmig.htm

http://chms.engineering.ucdavis.edu/students/undergraduates/labs/files/HT-Steel.pdf

http://products.esabna.com/EN/home/filler_metals_catalog/filler_metals_product_detail/q/display_id.id4367f2a96cada0.13220946/category_id.1003/path.filler_metals_allstate_steel_alloys_allstate_4130t

http://www.usweldingcorp.com/TDS/tds6375.pdf

http://www.usweldingcorp.com/low-alloy-steels.htm

Hopefully, you'll be able to decide which technique, pre-heat and interpass temps, filler wire, and post weld heat treatment is appropriate for your application! ;)

Enjoy the reading!!! :) :) :)

Respectfully,
Henry

By Tigger1106 Date 04-29-2010 02:36

Thank you Henry, you are the best.

By JamesReid Date 12-27-2019 04:04

[deleted]

By 803056

Date 12-27-2019 15:30

That's a difficult question to answer without knowing the size of your wallet.

I just purchased a multiprocess welding machine for my four grandsons as their "group" Christmas present. It was expensive, but it will allow them to learn and practice SMAW, GTAW, GMAW, and FCAW. The one machine is less expensive than buying multiple machines, it is compact, and has more than enough "umph" to weld anything they will be welding while they are in high school, The youngest is 13, the oldest 16, so they are good to go.

As a matter of fact, they are waiting for me to pick them up for a trip to the welding store to buy some welding electrode, so I better get a move on. We're going to start with SMAW first.

Al

By welderbrent (*****)

Date 12-27-2019 21:46

Way to go Grandpa. Show them how it's done. If you need some help...we are all here for you. We know you have gotten a little rusty in your old age...LOL.

By 803056

Date 12-27-2019 23:28

It’s like riding a bicycle Brent. Like the one you used to ride, the one with the big wheel in front and the small one in back. : grin:

New welding jacket; small, new leather welding gloves; small, new grinding shield, new welding helmet, power cable from the entrance box, receptacles, miscellaneous. Boy, it gets expensive quick! It's like buying a computer. It turns out the computer (welding machine) is the inexpensive part.

Al :grin: