weld-decay zone in the H AZ of the untr eate d sample suf- fer from severe grai n boun dary droppin g due to deep inte rgranu lar corro sion, as sh own in Figure 7a,b. ASTM A312 / A312M - 21 Standard Specification for Grain size determination and weld decay tests shall be performed. Each pipe shall also be subjected to the nondestructive electric test or the hydrostatic test. This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to
Mar 25, 2006 · Although it covers ASTM A249 supplmental requirement 7 (S7 weld decay testing testing), it does mention that ASTM262 is the wider application choice of the two tests and S7 testing only accounts for a small percentage of conditions where the use of Hydorchloric acid is required for cleaning out tubes that are "Coked" or lined with organic matter. Dekoron Unitherm LLCS7. Weld Decay Test S1. Stress-Relieved Annealed Tubes for certain materials S2. Air Underwater Pressure Test S3. Stabilizing Heat Treatment for TP 321, TP 347, and TP 348 S4. Intergranular Corrosion Test Product Marking ASTM A-450 plus heat number and heat treatment lot Laser welding of stainless pressure tubesJul 12, 2001 · The transverse section of a laser-welded tube in the left photo, seen as a scanning electron microscope (SEM) secondary electron image, was decay-corrosion tested using hydrochloric acid per the ASTM A249 S7 supplement. The base metal thinning in excess of weld thinning is evident.
PROTECTION & DISSIPATION- Over-voltage, over-current, over-heat protection. 0-10s adjustable current decay time, 0-15s adjustable gas delay time. The machine can be for multi-use, and can weld stainless steel, carbon steel, copper and other color metal, and also can use for traditional electric welding. S7 TIG&ARC Welding Machine Producing quality ASTM A249 and ASME SA 249 pressure Mar 26, 2001 · For example, the ASTM A249-S7 weld decay test is considered widely to be a reliable corrosion test, but, in reality, the acid used in the test applies to Quality AD TubiWeld decay test A249 S7 Weld decay test is the standard method for evaluating welding corrosion rate in stainless steels.
The S7 boiling HCl test is a good indication of weld homogenization. To ensure that the tubing will have no tendency toward selective or accelerated weld corrosion, a maximum corrosion ratio of 1 What is a Weld Decay? - Definition from CorrosionpediaJun 03, 2018 · Jun 03, 2018 · Weld decay is a corrosion process that mainly occurs as a result of sensitization (regions susceptible to corrosion) in the heat affected Zones (HAZ) of metal during welding operations. This process mostly occurs in stainless steels or certain nickel-based alloys. It is a form of intergranular corrosion. What is the Difference Between EN 10204 3.1 and 3.2 Sep 27, 2019 · S7 Weld Decay- Does your tubing and fittings pass the new ASME BPE testing requirements? February 24, 2020; The Affinity Laws- FAQ February 4, 2020; Commercial Update- Holland Applied Named Sole Quattroflow Distributor for Greater Midwest January 31, 2020; New Product Announcement- Introducing the ITT BioviZion Diaphragm Valve November 21, 2019
such as pits, scratches, dents, weld bead characteristics, surface inclusions, weld slag, etc. for polished and mill finished tubes. For additional information regarding industry standards requirements orthese and other to learn about United Industries Quality Management System, call 608 Understanding the Corrosion Characteristics of Seam-welded Mar 01, 2016 · The corrosion properties of the weld areas also can be tested using the S7 weld-decay test method described in the specification ASTM A249:Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger and Condenser Tubes.