10.5. Welding 10.5.1. Welding equipment: No welding process or procedure should be adopted

2700 WordsApr 23, 201911 Pages
10.5. Welding 10.5.1. Welding equipment: No welding process or procedure should be adopted without prior approval of Engineer-in charge. Unless otherwise specified, welding should be done in accordance with the codes API-1104.All welding machines, transformers/Diesel generators as may be required, line up clamps, beveling machines and other equipment used in connection with the welding work must be satisfactory and must be kept in good mechanical condition so as to produce sound welds. 10.5.2 Welding Process: • Welding under this specification should be done with following welding process subject to the approval of Engineer-in-charge / representatives. • Manual metal arc process • Oxy - acetylene Welding process •…show more content…
• During the process of welding, displacements, shocks, vibrations or stresses should be carefully avoided in order to prevent weld cracks. • Fillet welds should be made by shielded metal arc process regardless of the thickness and class of material. Electrode size should not exceed 3.25 mm. 10.5.4 Joints finishing: • When the welding has been completed, butt joints should have a capping (cover pass) so as to have gradual notch-free finish and good fusion at the joint edges. • The welds must be free from undercuts and any other defects and shall have regular appearance. • Welder's number must be stamped clearly on each and every joint, adjustment to the weld in order to identify the welder if defects will found after tests. 10.5.5 Inspection and test: • Owner's representative/agency appointed by the Owner will have free access to all working places for inspection of procedures, quality etc., during working periods. Contractor should provide all assistance to carry out such inspections. • All prefabricated as well as field welded joints should be subjected to visual examinations. Dye penetrant test will be done on all the joints of seamless pipelines which shall be followed by 10% radiographic examinations. • Visual examination must be 100% on all the joints and shall reveal surface defects such as misalignment,

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