where shall I use spray welding process

       

Spray welding process should be selected
under the following conditions:

(1) the surface load of all kinds of carbon
steel and low alloy steel workpiece is large, especially the impact load. For
the workpiece with the bonding strength between coating and substrate of
350-450n / mm2, the spray welding hardness is HRC150 ≤ 65, the coating
thickness is from 0.3 to several millimeters, and the surface roughness of
spray welding layer after grinding can reach ra0.4-0.1 μm.

(2) when used in corrosive medium, the
coating should be compact without pores;

(3) quenching, carburizing, nitriding and
hard chromium plating are used in the original design of workpiece surface,
which requires high hardness

(4) the working environment of the
workpiece is bad, such as strong abrasive wear, erosion wear, cavitation
erosion and so on.

(5) oxygen acetylene flame alloy powder
spray welding process is suitable for surface strengthening or repair of
various carbon steel and low alloy steel parts, but some characteristics of
parts materials should be noted. When the linear expansion coefficient of
matrix material is greatly different from that of alloy spray welding layer, it
is less than 12 × 10-6 / ℃ greater than 12 × If the content of elements with
high affinity to oxygen is more than 3%, such as tungsten and molybdenum, and
the total content of aluminum, magnesium, cobalt, titanium, molybdenum and
other elements is more than 0.5%, or the sulfur content of steel is more, it
will also bring difficulties to spray welding. This is because these materials
can easily form dense and stable oxide film by interaction with oxygen, In
order to prevent the wetting effect of the molten alloy on the matrix, the
liquid alloy will roll down like beads during remelting. Therefore, the
adaptability of the spray welding process to the sprayed matrix material should
be paid attention to when using the spray welding process.

(6) metal materials that can be spray
welded without special treatment:

① Carbon structural steel with carbon
content ≤ 0.25%

② The total content of MH, Mo, V, Cr and Ni
is less than 3%.

③ 18-8 stainless steel, nickel stainless
steel, gray cast steel, malleable iron, ductile iron, low carbon pure iron and
red copper.

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