Introduction of submerged arc welding wire and flux

NB/T 47018-2017 is the latest revision of NB/T 47018-2011 "Technical Conditions for Ordering Welding Materials for Pressure Equipment", the fourth part of which is submerged arc welding steel wire and flux, which made a lot of Modifications, including

In the welding material quality assurance book, the flux and welding wire batch number and inspection requirements are added; the phosphorus and sulfur content are specified for the welding wire and flux; F310-HXXX, F316CuL-HXXXIII, F317-HXXX are added to the submerged arc welding wire and flux type; The limitation of the elongation of the deposited metal tensile specimen after fracture is increased; the transverse bending specimen is allowed to be used in the bending test, and the requirement to allow the larger diameter of the bending core to be re-tested is added; the carbon steel and the low alloy are deleted. The water content of the flux for steel increases the provisions for the determination of the diffusible hydrogen content of the submerged arc welding deposited metal; the original Appendix A “Generally used steel welding wire and filler wire for submerged arc welding of pressure equipment” has been deleted. In general, the fourth part modifies the above points, so it seems that it is not intuitive. The following Yulin welding materials take you to see what changes are made on each page: so there should be corresponding reference documents for reference execution.

3.1.2 stipulates the contents that must be included in the quality assurance certificate for submerged arc welding materials for pressure equipment.

a> flux batch number and phase group welding wire batch number, as well as wire inspection, flux inspection and inspection results of deposited metal after welding; b> flux for carbon steel and low alloy steel should indicate flux type (neutral, active) ). The problem of sulfur and phosphorus content in the submerged arc welding wire mentioned above is specified in Article 3.2. The sulfur content of carbon steel and low alloy steel welding wire is not more than 0.015%, the phosphorus content is not more than 0.020%; the sulfur content in stainless steel welding wire is not more than 0.015%, phosphorus content is not more than 0.025%. 3.3 is to specify the phosphorus and sulfur content of the flux. Regardless of carbon steel low alloy steel or stainless steel, the sulfur content of the flux is not more than 0.035% and the phosphorus content is not more than 0.040%.