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  Reg. 611 (c), Reg. 611 (d), Reg. 611 (e)

QUALIFICATION TESTS FOR WELDERS ENGAGED IN WELDING OF BOILERS AND STEAM-PIPES UNDER CONSTRUCTION, ERECTION AND FABRICATION AT SITE IN INDIA AND IN REPAIRING BOILERS AND STEAM-PIPES BY WELDING

 

Reg 611

(c) Groove and fillet welded pipe and tube specimens


The groove welded pipe and tubes specimens shall be marked and test pieces cut out as in Figure XIII/3. The test pieces shall be prepared for face bend, root bend and etch test.

The pieces shall not be flattened, but tested in their curved conditions. The penetration bead may be removed to 0.8 mm. (1/32”) proud of the surface of the material.

  Fillet welded branches shall be tested for:-
  (i) Visual examination:-

The test welds so obtained shall be visually examined for root penetration, freedom from undercut, disposition of runs, uniformity of surface, shape of profile, smoothness of joint, freedom from cavities and slag, dimensions of weld deposit, quality of weld metal (overheating, surface cracks, spongy surface, etc.). Any piece showing serious defects shall be rejected.
  (ii) Macro examination:-

Each branch weld test piece shall be sawn as shown in Figure XIII/4 and each portion so produced shall be prepared and etched. The sections shall then be examined for degree of fusion, degree of root penetration, absence of non-metalic (slag) inclusions and quality of weld metal. The joint should show good root fusion, complete freedom from basal cracking, and the absence of any but very minor defects.



Reg. 611

(d) Welded Tube Joints

A test length approximately 203 mm long shall be cut from the tube with the welded joint disposed approximately at the centre. After visual examination, one test piece not exceeding 13 mm. for tubes 6 mm in thickness and below and thrice the thickness of the tube for thickness of over 6 mm. shall be cut longitudinally. The test piece shall not be less than 76 mm. in length on either side of the weld. The slight excess of internal bead may be filed until it is not more than 0.8 mm. proud of the general surface. The test piece shall then be bent back with the root in tension through 90 degree round a former of diameter equal to three times the thickness of the tubes. With regard to alloy steel pipes and tubes, the bend test specimen shall be bent without being straightened, but after removal of the weld reinforcement down to the level of but not below the surface round a former of diameter 4t and through an angle of 90°. The bending may be carried out by blows or by pressure. Care shall be taken to ensure that the former is so positioned that the weld is maintained at the crown of the bend. The test specimen shall be capable of being bent through 90 degree without signs of failure, although slight premature failure at the edges of a specimen need not be considered a cause for rejection. The opening out of a slight defect due to incomplete root penetration or lack of root fusion need not be considered a cause for rejection, provided the defect has sound metal at the back and on either side of it.




Reg. 611


(e) Additional tests before rejection

Should any of the test pieces tested in accordance with the above sub-regulations fail to meet the specified requirements, one further strip may be cut from the specimen and subjected to the same test. If any test piece does not reach the required standard two further welds shall be made and the procedure in the above sub-regulation repeated. If any of these welds does not reach the required standard, the welder shall be deemed not to have qualified for a certificate.
 
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