Re: [MW:32620] AISI 4145

Thanks ;

Infact we cleared this issue 

300 degree was the preheat given .. even we maintained the inter pass temperature above 250 .. finished the welding after 8hrs continuously without any interruptions.. finally gave pwht @ 600 degree with half hr hold .. later slow cooling with the thermal blanket still in place ..

Tempering must have gone away by this process and the tensile also would have come down .. but still we pressure tested it at 300 bar without failure 

On Mon, Nov 29, 2021 at 13:26 Simon Krismer <simon@wqms.com.au> wrote:

150C is way too low for 4145. The HAZ Hardness will be 50-60HRC at that temperature, and you are no doubt getting hydrogen cracking rather than lack of fusion. 

You will need 250C preheat at least, probably higher for the root run. 

On Friday, 30 July 2021 at 12:13:53 pm UTC+10 chris wrote:

Hello friends;

Was this query answered?

 I am also encountering a similar problem in welding 4145tube to S355.

we are experiencing a lack of fusion on the 4145 tube side.

Preheat given 150°C

Electrodes tried E7018 and E10018

MTC attached. The tube is Quench tempered.

Any suggestions on this?

Thanks in Advance.

Chris

 

On Monday, August 1, 2011 at 8:40:15 AM UTC+4 Mitesh Patel wrote:

Dear Mubben 

Please Find H/W Attached Doc. Which is help to selection of Welding  consumable ( SMAW & GTAW ) 

Mitesh Patel

Sr, QA/QC Engg

On Fri, Jul 29, 2011 at 10:31 PM, mubeen mubeen <mube...@gmail.com> wrote:

Hi,

Can anybody help me out in order to weld subject base material with appropriate consumables(Electrode or filler wire), along with its preheat and post weld heat treatment temperatures.

Regards,

Mubeen

QA Engineer

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0559695451

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