How to deal with intergranular corrosion in TA2 titanium welds?

I haven’t heard of any intergranular corrosion issues with titanium materials.

1. Intergranular corrosion testing methods are divided into: industrial testing methods and laboratory testing methods. The former refers to the testing methods specified in the quality standards for production, delivery, and acceptance by both the supplier and the buyer ； The latter is a method aimed at detecting intergranular corrosion; when used for product quality control, it is determined through negotiation between the supplier and the buyer. 2. Regarding industrial testing methods for intergranular corrosion in titanium, no such requirements are specified in the following documents: JB/T 4745-2002 “Welded Titanium Vessels”, GB/T 3621-2007 “Titanium and Titanium Alloy Sheets”, GB/T 13149-2009 “Welding Technical Requirements for Composite Steel Plates of Titanium and Titanium Alloys” (which states that the method for testing the corrosion resistance of welded joints shall be determined through negotiation between the supplier and the buyer). “Comprehensive Book on Chemical Equipment Design – Titanium Chemical Equipment”, “Comprehensive Book on Corrosion and Protection – Local Corrosion of Metals: Pitting Corrosion, Crevice Corrosion, Intergranular Corrosion”. This book lists the tendency to intergranular corrosion in various alloys (stainless steels such as austenitic stainless steels, ferritic stainless steels, martensitic stainless steels, austenitic-ferritic duplex stainless steels), iron-based high-nickel corrosion-resistant alloys, nickel-based corrosion-resistant alloys, aluminum and its alloys, copper alloys, magnesium-aluminum alloys, zinc, zirconium, lead), but there are no examples related to titanium. 3. Recommendations for the test method of intergranular corrosion in titanium welded joints: The test shall be carried out in accordance with the immersion test methods specified in the **standards for intergranular corrosion testing of metals and alloys (as listed below). The test solution should be the same one that will be used in the final container; after the test, inspection, comparison, and evaluation shall be performed using the loss of weight method, bending method, or metallographic methods. GB/T 32571-2016 \"Corrosion of metals and alloys – Test method for intergranular corrosion of high-chromium ferritic stainless steels\" GB/T 25151.3-2010 \"Test methods for the manufacture of urea high-pressure equipment – Part 3: Test for intergranular corrosion tendency of urea-grade ultra-low carbon chromium-nickel-molybdenum austenitic stainless steels\" GB/T 25151.4-2010 \"Test methods for the manufacture of urea high-pressure equipment – Part 4: Preparation of specimens for testing intergranular corrosion tendency of urea-grade ultra-low carbon chromium-nickel-molybdenum austenitic stainless steels\"