tailieunhanh - Lubrication and Reliability Handbook 2010 Part 12

Tham khảo tài liệu 'lubrication and reliability handbook 2010 part 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Table General guidance on the choice of process Process Cost of equipment Ease of operation Operator skill Applicability of the process to Heat input on surfacing Suitable surfacing alloys Large areas Small areas Thick deposits Thin deposits Thick sections Thin sections Massive work Small parts Edge build-up Site work Machined components Before During After Gas welding Low Easy Medium 3 1 1 2 3 1 3 1 2 1 2 Fair High May be diffuse desirable Many. Excellent for wc containing rods. Powder welding Low Easy Low 3 1 2 1 2 1 2 1 1 1 1 Low Fairly high None Restricted to self-fluxing alloys. Manual metal arc welding Fairly low Fairly easy Fairly high 2 2 1 3 . 1 3 1 3 3 1 3 Fair Very high May be steep desirable gradients Wide range available. TIG welding Medium high Moderately easy Fairly high 3 1 2 2 1 2 2 2 2 2 2 Low Very high May be fairly desirable confined Wide range available. MIG welding Medium Moderately easy Medium 2 3 2 3 1 3 2 3 3 2 3 Low Very high May be steep desirable gradients Restricted to alloys available as wires. Flux-cored arc welding Medium Moderately easy Medium 1 3 2 3 1 3 1 4 3 2 3 Low Very high May be steep desirable gradients Needs cored wires. Submerged arc welding Very high Moderately hard Fairly high 1 4 1 4 1 4 1 4 4 4 4 Low Very high Some diffuse Needs suitable coating materials or flux additions. PTA surfacing High Hard High 4 1 3 2 3 1 3 2 3 4 1 Low High May be moderate desirable gradient Many alloys possible. Electroplating High Fairly easy Medium 1 1 2 1 1 1 2 1 3 4 1 Low Low Low Generally Cr Ni and Cu for resurfacing. Powder spraying Fairly low Easy Low 2 2 4 1 1 1 2 2 4 1 1 Very low Low None Limited other than selffluxing alloys. Wire spraying Fairly low Easy Low 1 2 4 1 1 1 2 2 4 1 1 Very low Low None Considerable range including bond coats. Some ceramic rods. Arc spraying High Easy Fairly low 1 3 2 2 1 1 1 2 4 1 1 Very low Fairly low None Limited range of wires. HVOF spraying Fairly high Moderately easy Medium 2 2 2 1 1 1 2

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