What wire is used for welding of 316 stainless steel line?
Quality inspection of welding groove preparation, according to requirements of groove size, accuracy and surface quality stipulated in construction instruction and welding process instruction, groove quality including flatness, perpendicularity and cleanness.1, check the groove processing size (height, angle, edge and blunt edge, etc.) and accuracy isDoes it meet the relevant technical standards?.2, check the groove surface roughness and surface defects (cutting gap, crack,Layer and slag) if beyond the scope of the standard should be allowed to defect, repair treatment, such as surface roughness does not reach the standard, can use abrasive grinding.3. Check the surface cleaning quality of the groove. At least 200mm of the groove face and its sidesShould be clean within the scope, without burr, slag, rust, oil, film and paint and other harmful foreign bodies.4 、 nondestructive inspection of groove surface. For welding process documentation, specify the slopeMaterials such as CY-M steel, Fe-CY-N, high temperature steel and alloy steel shall be examined on the surface for nondestructive testing (such as coloring, etc.), and the defects such as cracks shall be removed.
Apply A102 (E308-16) or A202 (E316-16) welding rodAttention should be summarized as follows: welding rod should be dry, low current, fast welding speed, interlayer temperature of about 60 degrees, intermittent welding, in order to avoid intergranular corrosion, immediately after welding water cooling.
Inspection of assembly and tack welds;1, check the geometry and shape after assembly, whether it conforms to the provisions of the drawings. :2, assembly and assembly clearance is 1.5 - 2mm, using TIG welding, three point positioning welding,The welding seam position for the clock 3 points, 9 points and 12 points, the welding materials used should be the same as the welding materials, welding length is 10 15mm, welding requirements and guarantee no defect, the wrong side is less than 1.5 2mm.3, the group is not allowed to use strong assembly, the joint wall must be flush.4, when welding, there must be no air, slag, tungsten and crack.
