In the
first place: favorable circumstances of longitudinal submerged curve weldingIt
can harm the ingot throwing structure, refine the grain of steel, and wipe out
the imperfections of microstructure, so that the steel structure is...
In the
first place: favorable circumstances of longitudinal submerged curve welding
It can
harm the ingot throwing structure, refine the grain of steel, and take out the
imperfections of microstructure, so that the steel structure is minimized,
mechanical properties made strides. This change is for the most part reflected
in the moving bearing, so straight join basic steel pipe to a specific degree
is no longer isotropic; pouring the arrangement of air pockets, splits and
free, additionally in the high temperature and weight under the welding.
Second:
imperfections of straight crease submerged circular segment welded steel pipe
1, The
leftover anxiety brought about by uneven cooling. Lingering stress is without
outside drive under the inward self-balance push, a wide range of cross-area of
hot-moved steel have such remaining anxiety, the general steel cross-sectional
size, the more noteworthy the leftover anxiety in spite of the fact that the
remaining anxiety is self - adjusted, it has some impact on the execution of
the steel individuals under outer strengths, for example, misshapening, security,
weakness resistance et cetera, which may have an unfavorable impact.
2, After
the welding, the non-metallic considerations inside the straight crease steel
pipe are squeezed into the sheet, and the stratification is brought about. The
execution of the DSAW steel pipe in the thickness bearing is significantly
weakened and there is a probability that the weld, the nearby strain initiated
by the weld shrinkage frequently achieves a few times the yield point
strainFree Web Content, substantially bigger than the heap created by the heap.