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Coke Tower welding of stainless steel clad plate


. 008l5.4】 <O. 101. . 79 <0.10 Table 7 levels of welding parameters welding specifications polarity welding current A voltage V Bei mm speed mm/min1-2 straight, anti-R3073.290 a ll022-26 ・. 0-ll0 electrodes 3-6 straight. Anti R3074.0140-l6O22 ~ 2690l30 Arc 7 straight against Ni1823.29o-ll022-26l00-1208 straight. Anti Ni1824.0140-l6O22-26901303.3.9 welding sequence of stainless steel butt weld compound in the order shown in Fig. First make a good groove assembled stainless steel sheet, the first welding the grassroots level. After basic welding seam you want to check (including the weld seam surface and internal quality), recognition of weld quality (especially the internal quality of a weld to pass standards in order to make preparations for solder interlayer. Second one side of the complex layers of stainless steel plate cut to shovel, and rounded to be welded into the roots. In order to prevent the lack of penetration, shovel cut to expose the grassroots level to carry out until the low-alloy steel, and polished clean. welding transition layer, the stable molten weld to stainless steel cladding to a certain thickness, can play a role in isolation. interlayer welds (including weld internal quality) have reached the required standard, in the transition layer on the welding of stainless steel weld cladding. welded stainless steel multiple layers, without affecting the quality of welded joints under the premise of multiple layer welding can speed up the cooling rate, to avoid multiple layers at 600 ~ 1000 ~ stay too long, and affect the corrosion resistance. 32 Primary 2. Interlayer 3 . multiple layer weld welding sequence in Figure 3 4 Note (1) If it is found before welding stainless steel sheet with stratification, does not allow welding. If the layered groove edges can cause multiple layers and plate poor bonding between the grass-roots level. At this point all of stainless clad steel plates must be non-destructive testing, such as to determine the stratification is small, can be layered for the total eradication of welding (ie welding), only after a formal repair welding. (2) primary side and clad the side to be welded, it shall be, respectively, using dedicated tools such as wheel and wire brush, grass-roots side must use steel wire brush, undone layer side must use stainless steel wire brush. (3) on multiple layers, primary and transition layer of welding material used to make clearly marked, respectively, strictly separated to prevent confusion. absolutely prohibit the use of welding welding welding materials grassroots stratified transition layer or welding. The same must also prevent the welding material welding multiple layers used the wrong base or transition layer in the welding seam on. (4) Welding transition layer, in the circumstances to ensure penetration, in order to reduce the dilution of alloying elements, I hope the fusion than the smaller, as far as possible a small welding current, Fast welding, welding is not allowed to do horizontal swing, transition is the width and depth of melting keep uniform. welding multiple layers try to use low-carbon welding materials, aims to improve the corrosion resistance of weld metal. welding should be chosen small heat input, so in the 6o0 ~ 1000 ~ stay as short as possible to avoid being intergranular corrosion. (5) must be strictly before welding groove grinding rust, welding rod, according to the required temperature (350-400 ~ ) stored after drying at 100 ℃ for 2h temperature inside insulation, non-temperature drying out. SMAW process requirements are strictly controlled by heat input. 5 primary weld seam after welding inspection, the complex side of the grass-roots level weld surface polished smooth, according to JB4730-94 for 100% PT checks, I-level pass, and then transition layer and re-surfacing layer. surfacing is completed, the welding surface polished smooth, 100% PT inspection of the surface level I qualified. according to JB4730-94 for 100% RT inspection, Ⅱ level qualified, the ratio of 100%. 6 Conclusion (1) 15CrMoR Weldable worse than carbon steel, welding preheat must be taken, after the hot, post-weld heat treatment, the control line energy and the layer temperature and other measures. (2) welding the welding process before the formulation of a reasonable and carefully control the welding process, can avoid cracks, access to high-quality welded joints. (3) in the welding process, select the correct welding sequence Welding norms and small can increase the corrosion resistance of stainless steel cladding.