tailieunhanh - Industrial Machinery Repair Part 15

Tham khảo tài liệu 'industrial machinery repair part 15', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 474 Maintenance Welding Table continued Base metal type Recommended electrode AWS filler metal specification use latest edition Electrode diameter Current range Amperes Material type Electrode classification in. mm Steel Hot rolled or cold-drawn plain carbon steels ER70S-3 or ER70S-1 ER70S-2 ER70S-4 ER70S-5. ER70S-6 1 16 5 64 3 32 1 8 40-220 60-280 125-380 260-460 275-450 Steel Higher strength carbon steels and some low alloy steels ER80S-D2 ER80S-Nil ER100S-G 1 16 5 64 3 32 1 8 5 32 60-280 125-380 275-450 2Spray transfer mode. Trademark-International Nickel Co. Table Metal Shielding gas Advantages Aluminum Argon 0 to 1 in. 0 to 25 mm thick best metal transfer and arc stability least spatter. 35 argon 65 helium 1 to3 in. 25 to 76 mm thick higher heat input than straight argon improved fusion characteristics with 5XXX series Al-Mg alloys. 25 argon 75 helium Over 3 in. 76 mm thick highest heat input minimizes porosity Magnesium Argon Excellent cleaning action. Carbon steel Argon 1 5 oxygen Improves arc stability produces a more fluid and controllable weld puddle good coalescence and bead contour minimizes undercutting permits higher speeds than pure argon. Argon 3 10 CO2 Good bead shape minimizes spatter reduces chance of cold lapping cut not weld out of position. Low-alloy steel Argon 2 oxygen Minimizes undercutting provides good toughness. Continued Maintenance Welding 475 Table continued Metal Shielding gas Advantages Stainless steel Argon 1 oxygen Improves arc stability produces a more fluid and controllable weld puddle good coalescence and bead contour minimizes undercutting on heavier stainless steels. Argon 2 oxygen Provides better arc stability coalescence and welding speed than 1 percent oxygen mixture for thinner stainless steel materials. Copper nickel and their alloys Argon Provides good wetting decreases fluidity

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