Welding Compatibility

[alipudin]

PLease advise the compatibility of welding different material as follows:
1)ASTM A694 Gr. F65
2)ASTM A860 Gr. F65
3)ASTM A234 Gr. WPB
4)ASTM A105

Can this material be welded?
What is the different between ASTM A694 and A860, which material is better for high strength fittings? Please advise.

 

[Metalguy]

No. 3 and 4 are plain low-carbon steels-easily welded.

 

[alipudin]

Thanks.

I want to know if this material can be welded between each others.

 

[metengr]

To follow up on the previous thread;
ASTM A 694 Grade F65 per the ASTM specification is for carbon and low alloy steel pipe flanges, fittings, valves and parts for high pressure transmission service. According to part 6.2, the steels specified by grade (strength) shall be within chemical composition limits in Table 2 (0.26% C max, 1.40% Mn, max, P and S, 0.025% max and Si .15-.35%) to ensure weldability.

ASTM A 860 Grade WPHY65 per the ASTM specification is for wrought high strength low alloy steel butt welding fittings for high pressure transmission service. The carbon equivalent is limited to 0.45 by specification.

The material supplied under both specifications are considered weldable and compatible for joining to each other and to material supplied under SA 234 WCB and SA 105 specifications with a 70 ksi filler material - low hydrogen (H4) electrode. I would strongly suggest you follow ASME Section VIII, Div 1 requirements for welding preheat and post weld heat treatment.

The ASTM A 860 specification, versus the A694 specification, is probably the better for high strength fittings because it provides for the use of low (micro) alloy steels - the carbon max is limited to 0.20% but other alloy elements are permitted to assure the carbon equivalent remains below 0.45 for weldability.

 

[YLWEA]

I agree these can be welded together successfully using proper welding procedures including appropriate combinations of low hydrogen practices and/or preheat, heat input, and PWHT. My only addition to the previous input is that I normally request and review the MTRs for the materials and consider the actual carbon equivalent and thickness of each item when developing the applicable welding guidance. The alternative is to take a conservative approach and assume worst-case C.E. for each item which is likely to result in more restrictive welding practices (higher preheat, etc.)

 

[sayee1]

A694 and A860 are normally used for pipelines. the 65 implies 65ksi YS and 77 ksi UTS. Though typically a 70 ksi consumable would generally meet the strength requiremenst, I would prefer welding them with a 80 ksi consumable, especially since typically these materials are also used for their higher toughness props. Typically when used in pipelines we weld the first two grades using {E7010P1(root)+E8010P1(fill & cap)}/{E7016-1(root)+E8018Cx/E7018} where the X is 1, 2 or 3 based on the impact requirements and chemistry restrictions. In addition note that A 234 WPB and A106 Gr B are plain low-carbon steels-can be welded to themselves or the first two grades by any of the consumable listed above but E7018/E7016 should be good enough for the application.
One earlier post talked about PWHT, remember to ensure that the PWHT temperature is less than the tempering temperature as the first two grades would be Q&T steels.

Thanks and regards
Sayee Prasad R
Ph: 0097143968906
Mob: 00971507682668
email: sayee_prasad@yahoo.com
If it moves, train it...if it doesn't move, calibrate it...if it isn't written down, it never happened!

 

[alipudin]

Thanks guy for your invaluable answers.

Regards,
Alipudin