Classification of submerged arc welding wire-flux combinations
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For double-sided single-pass submerged arc welding of Q235B plates, H08MnA+HJ431 was previously used; now, according to Table 4 of the new standards, what is the appropriate combination? Is it S43SYMS-SU26? If any expert is available, please provide some guidance.
Yes, according to the combined classification in Table 4 of the new standards, for single-pass submerged arc welding on both sides of Q235B plates, the previous combination of wire H08MnA and flux HJ431 can now be classified as S43SYMS-SU26. This classification reorganizes the performance characteristics and application ranges of welding materials and fluxes in accordance with new standards, ensuring that the welding results and quality meet the latest industry standards. .
Thank you for your reply. In your picture, it is S43×0MS-SU26. According to GB/T5293, the “×” symbol indicates multiple passes of welding; X denotes multi-pass welding, while S denotes single pass welding on both sides. In S43×0MS-SU26, the digit 0 represents the temperature for the impact test; a value of Y indicates 20°C, while 0 denotes an impact test at 0°C. The impact temperature for Q235B steel plates is 20°C, so Y is used. Please take another look to see if my understanding is correct. Thank you!
S43A0MS-SU26
Among them, 43A indicates that the minimum tensile strength of the multi-pass weld metal in the as-welded state is 430 MPa. My joint is double-sided single-pass welding; then why isn’t it 43S here, just like in Example 2 of the standards? Thank you!
In the classification codes for welding materials, the use of the letters “S” and “A” after the numbers is indeed related to the conditions and requirements of welding. The letter “A” denotes the tensile strength of the deposited metal under all weld pass conditions, whereas “S” specifically refers to the tensile strength of the deposited metal in the case of a single weld pass or a surface weld pass. In your case, although it is single-pass double-sided welding, if the standards or product specifications explicitly require the use of a mark indicating full weld pass performance (i.e., the use of “A”), then that requirement must be followed. In your engineering projects or specific applications, it may be necessary to ensure that even in the case of single-pass welding, high tensile strength standards are met; therefore, the designation “43A” might still be used. The specific choice should be determined based on engineering requirements, safety standards, and the recommendations of material suppliers. If you have any doubts or need further confirmation, it is recommended to consult the welding material supplier or a professional welding engineer to ensure compliance with all relevant technical and safety standards. .
I would like to ask again: In the classification requirements for stainless steel wire and flux combinations used in submerged arc welding as specified in GB/T17854-2018, the referenced standard GB/T29713 deals with stainless steel wires and strips. This standard defines filler wires and strips; the wires used in submerged arc welding, as we commonly refer to them, are defined as strips in this standard, and the letter B is used in their model numbers. However, in the example on page 2 of GB/T17854-2018, S308L is used to denote the wire model. This is confusing; according to GB/T29713, shouldn’t it be B308L here?
It is recommended to select in accordance with the requirements of standard NB/T47015.