In manufacturing, the key of end cover hinder is welding. Since by
manual arc welding, the weld joint is single-side welding without
quality guarantee at the ends. In addition, due to large welding
workload, frequent return for repair and long working period, it
became the throat process of the whole hinder production.
When making hinders of the style, we adopt advanced production
technique, complete large equipment and mature technology,
especially automatic submerged arc welding between hinders and end
covers. Such welding methods have high manufacturing efficiency,
good quality, beautiful welding shape, safety, reliability, etc.
|1||Headers form an important part of all types of boilers.|
|2||Steam from the generating tubes is collected in headers which are
therefore always under pressure.|
|3||This pressure may vary from 300 psi to 2000 psi. Since headers are
always under pressure, the utmost care is taken by us while
|4||Depending on the generating capacity of the boiler the header sizes
fabricated by us vary from 100 mm to 600 mm NB. The stubs of
various sizes are very carefully welded to the main body of the
header to provide the desired openings from the header.|
1.The necking hinders of the Company are made by hot press and
retracting of seamless steel pipes at special hinder necking
2.In this way, the hinders will have thicker walls and cleaner
surface. The necking cover will form membrane stress rather than
bending stress with desired stress performance under the effect of
1. Strength calculation report with applied materials information.
2. 100%NDT(non-destructive inspection) report of steel plate, tube
and welding rod.
3. 100%X-ray inspection report (welding seam): to ensure the
quality of the entire boiler.
4. Hydraulic test report: ensure the standard working pressure and
5.Excellent in welding quality, highly automatic, safe and reliable.
|Material||Carbon steel,Alloy steel,Stainless steel.|
|Length||According to costumes requirements.|
1. Carbon steel:20G,SA-106B,SA-106C,etc.
2. Low-alloy thermal resistant
3. Middle-alloy thermal resistant steel:SA-335P91,etc.
4. Special material(ultra-supercritical):SA-335P122,SA-335P92,etc.
The boiler headers have water wall header,superheater
header,economizer header and so on. It acts action of gathering,
mixing and redistribution in boiler systems. In structure, they
include end cover hinders or necking hinders.