Welding of Solid Members
Welding of Solid Members
(OP)
In practice, is it possible to weld two pieces of solid section (Fy=360 MPa) 250x150 mm. together on site ? If yes, is there special care for this case?
Thank you in advance.
Thank you in advance.





RE: Welding of Solid Members
RE: Welding of Solid Members
1.) What position is the joint in? (Some processes are limited by position including the 2 previously mentioned)
2.) Environmental conditions? (high wind or moisture present?)
3.) Many materials have a mechanical property range you specified, could you be more specific? (The type of material may determine which process is the most practical)
4.) You mentioned on-site, does this mean they are in-place? (If so, is high joint restaint in your considerations?)
I have a few more ?'s, but you could help resolve your problem by providing a bit more info.
Good Luck.
RE: Welding of Solid Members
1.) These two pieces are aligned vertically as the following picture.
|| <--- Top member (first piece,
|| already connected to other members)
||
-- <--- Welded joint
||
|| <---- Bottom member (second piece,
|| no restraint to this member )
||
2.)Environment condition for relative humidity say 70%. This is 10 metres above ground basic wind speed here for return period 50 years around 33 metre/second
3.) Material grade is ST52-3 (DIN18800).I don't know the chemical compound and how to equivalent to US standard.
4.) Position on-site of member approximately 10 metres above ground.
Please give me the roughly idea is fine. I have to research more by myself in details. :)
Thanks.
RE: Welding of Solid Members
RE: Welding of Solid Members
Chemical compound :
Carbon 0.17-0.23 %
Silicon <=0.60 %
Manganese 1.00-1.50 %
Phosphorus<= 0.02 %
Sulphur <=0.015 %
Chromium <= 0.30 %
Molybdenum <= 0.15 %
Nickel <= 0.40%
RE: Welding of Solid Members
You can bevel the upper member and use a single bevel groove weld. The bottom member is a "shelf" where the weld is deposited upward along the groove (beveled) face.
RE: Welding of Solid Members
2.The material shows some Cr,Mo and Ni % indicating the strength might be higher than a plain C-Mn steel. In that case I am not sure if you have FCAW-SS wires to match the composition/Mechanical properties, but you could check up with Lincoln. FCAW-SELF SHIELDED (innershield) process :30 miles/hr (48 km/hr) Based on Manufacturer's (Lincoln)Recommendation, so wind velocity not a problem, even if the wind speed increases you can always install wind breakers.
3.FCAW-GAS SHIELDED (‘dualshield’) process : 5 miles/hr (8 km/hr) Based on AWS D1.1, again wind velocity not a problem, but check on suitable consumables with manufacturer's.
For both the FCAW processes, the maximum torch length would be around 2.5 m, and the wire feeder to power source cable another 2.5m, so you may need to move the welding power source and wire feeder up so that there is not too much voltage drop because of the cables.
4. Again, the simplest method is of course the SMAW(Consumables should be the easiest to source), but understandably, since you want to improove the deposition rate, you may want to consider using larger diameter electrodes upto 8mm size, and further consider productivity by using two welders simultaneously from both sides of the plate.
Note that the processes I have listed are in the order of preference I would use based on whatever I could understand of the application.
Thanks and regards
Sayee Prasad R
Ph: 0097143968906
Mob: 00971507682668
End of all knowledge is the attainment of immortality!
RE: Welding of Solid Members
RE: Welding of Solid Members