Welding GS-45 cast steel (modern equivalent GE240 / 1.0446)

[Mikko Laine]

Hello,

we have an old machine part with two 28 mm keyway slots ground out due wear. We need to fill up those key ways and machine new slots but due to construction limitations any other methods such as machining a replacement bore insert are not suitable.

Slots are approximately 36mm wide, 7mm deep and 140 mm long. The bore diameter where they are located is around 140mm. So far we have received mixed opinions on weldability of this material: one slight "yes might be doable with correct procedure" and two "DO NOT WELD IN ANY CASE!!!"...


So do any of you have good guidance on suitable welding procedure for cast steel GS-45?
Best regards,
Mikko Laine

[c sridhar]

If you are confident, yes, you can do the repair work. For machinable

weld, you can use:

1.    98 Ni (+)2 fe - (AWS/SFA  E Ni-CI)

2.    55 Ni (+) 45 Fe - (AWS/SFA  ENi-Fe-CI)

3.    65Ni (+)4Fe (+) 30Cu - (AWS/SFA- Ni-Cu B)

Pre-heat to 75- 100 deg. C to remove oil, grease, rust, paint strains and

use above electrodes. If you use any other LH electrode like E 7016,

preheat  should be on higher side (say 350deg. C) and have to maintain

inter pass temperature and slow cooling rate.

Not worried about colour matching  and chemistry try with E 308

(or) E 309. With its high ductility, these electrodes may help you at times. 

Sridhar.

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[Chintan]

Use any ni base electrode like ENiCrMo3 for this weld, before welding do backing at 250 deg cel min for 30 min then maintain 150 deg cel during welding interpass must be contoll at 300 deg cel max
After welding cover with blanket to reach room temp at uniform rate of cooling