Analysis of process of bead shaping in cladding on narrow substrate

Abstract

Analysis of geometry dependencies of bead shaping was carried out at full-scale modelling of technologically possible cross-sections of beads deposited on narrow substrate of 0.5-5.0 mm thickness. The tasks were specified for technological regulation of shape of single-layer bead and series of process criteria was stated, namely efficient rising of narrow substrate being deposited, optimum effective cross-section of the bead and acceptable side machining allowances. Proposed are the formulae for estimation engineering calculations determining the relationship between required height of deposited layer, bead size, mass of deposited metal and filler consumption. 16 Ref., 3 Tables, 9 Figures. K e y w o r d s : microplasma powder cladding, nickel heat-resistant alloy, narrow substrate, full-scale modelling of bead cross-section, process criteria of bead shape

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“…A surfacing heat input can be such an additional criterion of the process strength based on stated in works [11,14] relationship of tendency to crack formation for considered welded joints and total heat input in the part as well as stated in this work dependencies of regulation of cross-section of the deposited bead. Thus, cross-section area of the deposited layer in multi-layer surfacing shall be selected taking into account heat input for determination of narrow substrate width.…”

“…where Q S is the heat input in the anode taking into account effective efficiency of part heating [1,11]; L is the given length of elliptic bead cylinder. Cross-section areas of the deposited bead F b and deposited metal in it F db = F b -F rbm were determined using calculation by procedure of work [14] based on measurement of width, height of bead and base metal penetration depth with up to 0.05 mm accuracy, according to…”

“…A set range of values of bead shape coefficient B/H in 0.77-1.22 limits (see Table 1) allowed specifying technologically possible schemes of shaping of deposited bead [14] varying a series of process factors of microplasma powder surfacing: width of…”

Peculiarities of bead shape regulation in single-layer microplasma surfacing on edges of aircraft gas turbine engine blades

“…where Q S is the heat input in the anode taking into account effective efficiency of part heating [1,11]; L is the given length of elliptic bead cylinder. Cross-section areas of the deposited bead F b and deposited metal in it F db = F b -F rbm were determined using calculation by procedure of work [14] based on measurement of width, height of bead and base metal penetration depth with up to 0.05 mm accuracy, according to Figure 1. Thermal efficiency for ZhS32 deposited metal was determined by calculation [11] proceeding from its cross-section area…”

“…A set range of values of bead shape coefficient B/H in 0.77-1.22 limits (see Table 1) allowed specifying technologically possible schemes of shaping of deposited bead [14] varying a series of process factors of microplasma powder surfacing: width of d = 0.3-2.0 mm depending on toughness of weld pool molten metal (i.e. deposited metal, since g 0 → min) is characterized by the following changes of shape of deposited beads cross-section:…”