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Reg. 125
FURNACES

 

Fusion Welded Longitudinal Seams

Where the longitudinal seam is fusion welded the following precautions shall be observed :-

a) Plates 5/8 inch and above in thickness shall be bevelled from both sides of each abutting edge but the bevel need not necessarily be the same on each side (see Figs. 1 and 2). Plates, less than 5/8 inch in thickness may be beveled from one side only of each abutting edge (see Figs. 3 and 4).

The included angle of the bevel shall be not less than 60° and the beveling may be any one of the forms shown in Figs.1-4

b) In order to obtain full penetration of the weld metal a gap shall be maintained between the plates when they are being welded. Joints shall be welded from both sides, and the slag shall be removed after making each run. Before the second side of the joint is welded any slag or defect at the bottom of the first run shall be removed by grinding, chipping or machining. There shall be no appreciable undercutting of the plate.
c) For the purpose of relieving internal stresses the plates adjacent to a fusion weld shall be efficiently annealed after welding, and when the firebox is forge-welded it should be allowed to cool gradually.
 
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Message from Chairman of Central Boilers Board About Central Boiler Board History of Indian Boiler Regulations Foreword Contents Chapter Wise Contents Regulation Wise List of Amendments
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