Stainless Steel Solid Welding Rod for TIG welding of size: 1. 6 mm. Dia x 1000 mm. Length ( 100 nos. per packet ) shall conform to AWS. A/ SFA 5. 9/ 93 grade ER 308L. The delta ferrite content of weld metal of the welding rod shall be in the range of 5 to 10Fn ( ferrite number ). The manufacturer shall have RDSO approval ( part- I ) for their stainless steel solid MIG/ MAG welding filler wire ( ER 308L ) to Specn. clause 6 of IRS M- 46- 2013 grade as per AWS A5. 9- 10.