Regarding point no:6
4130 is the original "chrome moly" steel. Still one of the most widely
used aircraft grade low alloy steels because of its combinations of
weldability, ease of fabrication, and mild hardenability from heat
treatment. In thin sections, can be hardened and tempered to high
strength levels, although caution is advised here. In its most widely
used normalized heat treat condition, it has good strength levels in
the 90,000-125,000 psi tensile range (Rc20-27) Excellent weldability
for an aircraft alloy. Can be case hardened by nitriding,
carbonitriding and at times carburizing. Needs surface finishing for
corrosion protection. Standard surface prep before plating. Can be
very susceptible to hydrogen embrittlement in the very high heat treat
conditions > Rc 36.? Many times used as a casting alloy, although now
being replaced by PH grade stainless steels.
Welding of AISI 4130 to API 5L Gr.B
Preheat: 150 DegC
Preheat Maintenance: 150 Deg C
Interpass: 250 Deg C
Consumables: ER 80SB2+E 8018-B2 (GTAW+SMAW)
PWHT: 650-700 Deg C (Holding 1Hr/inch)
Heat Input: 1.5 KJ/mm (maximum)
Hope the above information is useful.
Cheers!
Raj
On Apr 19, 7:25 am, "duplex" <sduple...@gmail.com> wrote:
> Friends,
>
> 1-What standard requirement for hole repair weld to remove defect.Is it can reach to root or any % of thickness.
>
> 2-Any standard/spec can covered for defect appear at root area for high pressure part.
>
> 3-From API 6A àclause 6.4.2 for PSL1, 2 & 3:
>
> The requirements for PSL 1 shall apply for PSL 2 and PSL 3 with the addition of the following requirements for
>
> bolt hole, tapped hole, and machined blind hole repair.
>
> The following apply.
>
> a) The welder/welding operator shall perform an additional repair-welding performance qualification test using a
>
> mock-up hole.
>
> b) The repair-welding-qualification test hole shall be qualified by radiography in accordance with 7.4.2.2.14 or
>
> shall be cross-sectioned through the centreline of the hole in two places 90° apart and macro-etched to
>
> confirm complete fusion. One surface of each of the four matching segments shall be macro-etched. This
>
> evaluation shall include the total depth of the hole.
>
> c) The repair-weld qualification shall be restricted by the following essential variables for performance controls.
>
> ⎯ The hole diameter used for the performance-qualification test is the minimum diameter qualified. Any
>
> hole with a diameter greater than the diameter used for the test shall be considered qualified.
>
> ⎯ The depth-to-diameter ratio of the test hole shall qualify all repairs to holes with a same or smaller depthto-
>
> diameter ratio.
>
> ⎯ The performance-qualification test hole shall have straight parallel walls. If any taper, counter-bore or
>
> other aid is used to enhance the hole configuration of the performance test, that configuration shall be
>
> considered an essential variable.
>
> API 6A-Appendix E
>
> :
>
> 5-How about other standard related.
>
> 6-Here who familiar with material 4130.What common problem with documentation&during&after weld? Consumable match when 4130 join to api 5L pipe.
>
> Thanks,
>
> Regards,
>
> Duplex
>
> image003.jpg
> 7KViewDownload
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