Girth-welding process for a pipe and a high cellulose type coate

Electric heating – Metal heating – Of cylinders

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

21914523, B23K 3522

Patent

active

052723054

ABSTRACT:
Chemical compositions of a base metal and a high cellulose type welding electrode are regulated within predetermined ranges, so that the chemical composition of the weld metal obtained from the welding can be regulated within a predetermined range. Particularly, with respect to the weld metal, the Mo content (Mo)1 in the weld metal and the Mo content (Mo)2 in the base metal are regulated such that the difference between the both contents .DELTA.Mo (=(Mo)1-(Mo)2) is 0.03% or more, and PCM is 0.30% or less, where PCM is defined as follows: PCM=(C)+(Si)/30+(Mn)/20+(Cu)/20+(Ni)/60+(Cr)/20+(Mo)/15+(V)/10+5(B). Here, (M) denotes a content (weight %) of a component M in the weld metal.
On the other hand, a coating flux of the high cellulose type coated electrode contains relative to the total amount of the coating flux, 0.1 to 7.0% of MgO, 7 to 25% of iron oxides (in FeO equivalent), 8 to 19% of TiO.sub.2, 10 to 30% of SiO.sub.2 and 5 to 27% of Mn, and a core wire and/or the coating flux includes 0.06 to 1.10% of Mo relative to the total amount of the welding electrode. A ratio of the weight of the coating flux to the weight of the welding electrode being 0.10 to 0.19. By this, preferential corrosion resistance, toughness and crack resistance can be improved in the weld metal of a girth weld zone of a pipe which might be exposed in a corrosion environment containing CO.sub.2.

REFERENCES:
patent: 4517441 (1985-05-01), Kaljee et al.
patent: 5206475 (1993-04-01), Wada et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Girth-welding process for a pipe and a high cellulose type coate does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Girth-welding process for a pipe and a high cellulose type coate, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Girth-welding process for a pipe and a high cellulose type coate will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-310468

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.