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  1. gtaw

    Bowstring Steel Pedestrian Bridge Connection Details (Top and Bottom Transverse Members and Diagonals)

    Or consider pin connections like those used for a crane boom.
  2. gtaw

    Need feedback on my jig design for welding aluminum sheet metal – flatness + dimensional control is key

    Remember the mechanical properties of all aluminum alloys are degraded by welding. Check with an applicable welding standard to see what the properties are in the "as welded" condition. Some alloys approach a 50% reduction in yield strength.
  3. gtaw

    Bowstring Steel Pedestrian Bridge Connection Details (Top and Bottom Transverse Members and Diagonals)

    Tubular sections look so clean on paper, but they are a bear to erect in the field. How does one place the bolt or nut w/ washers in the closed connection? To say there is limited access is an understatement. If the nut is tack welded inside the HSS, how does the erector use drift pins or spud...
  4. gtaw

    Weld Callout Leader Direction

    Buy a copy of A2.4 from AWS.
  5. gtaw

    Welding Procedure Specification (WPS) for the base metal AISI 8630(weld overlay cladding

    Find an ASTM material specification that includes the AISI material with mechanical properties. Mechanical properties are dependent on the chemistry, method of manufacture, and final heat treatment. AISI specifications only specify the chemistry, so the mechanical properties can vary due to...
  6. gtaw

    GMAW shotcircuit - Lack of fusion

    Just because it has been eliminated from the code doesn't mean the short comings of the process have been eliminated. GMAW-S has a well earned history of having issues with fusion type defects. We had a project inside the biological shield in a nuclear powerhouse years ago. Due to concerns...
  7. gtaw

    Manufacture and testing of welds — Production test

    What welding standard are you folks quoting from? It makes a difference.
  8. gtaw

    Question about weld fillet reinforcement in PJP or CJP joints

    Yes, the reinforcing fillet weld mitigates the stress intensification that would result from a sharp corner in a T or corner joint.
  9. gtaw

    How to know exactly which filler metal?

    AWS D1.6 includes a matrix of Austenitic stainless steels and recommended filler metals. You can also use the WRC diagram as modified by Dr. Kotecki and Dr. Liphold (sorry if the spelling is incorrect) that can also be found in AWS D1.6, You can calculate the chrome and nickel equivalents to see...
  10. gtaw

    bevel weld detailing

    A double sided groove weld made without back gouging or a single sided groove weld made without backing without qualification by testing to be considered to be a partial joint penetration groove weld. Reference: AWS D1.1/D1.1M:2020 clause 5.4.2.1. The work around is to qualify the WPS for...
  11. gtaw

    Undermatching filler metal - AWS D1.1 and ASME IX

    AWS D1.1/D1.1M:2020 allows the designer to use of filler metal that under matches the base metal, but the provision is limited to 10 ksi below the minimum specified tensile strength of the base metal and the use of under matching filler metal is limited to specific weld types. See Table 4.3...
  12. gtaw

    bevel weld detailing

    It depends on what your governing standard is. As indicated by the welding symbol you included in your post, the 1/4-inch dimension is the depth of the bevel. For the bevel, the depth would be measured through the thickness of the part being beveled. If AWS D1.1 is the governing standard, the...
  13. gtaw

    Sequence Back Weld

    You didn't mention the governing standard, but all the fabrication standards I've worked with require CJP welds to be made with backing, double sided groove welds that have been back gouged and back welded, or the WPS for CJP without either backing or back gouging must be qualified by testing...
  14. gtaw

    Welding Rimming Steel

    Start with a certified material test report so you know what you are dealing with.
  15. gtaw

    Weld penetration details

    I'm not saying this is a good detail for the application. The question was asked what the sketch meant. If the nozzle and vessel is large enough to have access to both sides of the joint, it isn't impossible. We don't have all the information to make that call.
  16. gtaw

    Weld penetration details

    Double sided groove welds made without back gouging are considered to be partial joint penetration groove welds unless the WPS was qualified without back gouging. From the sketch, it appears the bevel groove on the bottom side is welded first and then back gouged from the top side. Then the...
  17. gtaw

    Welding Electrode for Corten Steel

    If the governing document is AWS D1.1/D1.1M, it is permitted to weld weathering steels with single pass fillet welds or groove weld (per side) provided the size of the weld is limited. The thought is that there will be sufficient alloy "pick-up" via dilution to maintain the weathering...
  18. gtaw

    Welder Qualification

    Welder performance qualification is a separate function from qualifying a welding procedure specification. If you are working to ASME Section IX, the mechanics of qualifying a WPS is addressed in Article II. The mechanics of qualifying a welder is addressed by Article III. Article IV provides...
  19. gtaw

    Internal CRO in PQR - ASME IX

    The sketch is very helpful.
  20. gtaw

    Internal CRO in PQR - ASME IX

    Can you provide a sketch of the joint used to qualify the WPS you already have? I can't picture exactly what you did from the description you provided. As recorded by the PQR, is the P-1 material welded to the P-10H material using Inconel 625 filler metal?

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