Soldering esp printed circuits - using flux contg vehicle and reducing agent released as gas after evaporating vehicle

At least one of reducing agents is released as gas after evaporation of the vehicle in soldering process, esp. for printed circuits, in which a flux, consisting of a vehicle, pref. EtOH, and a reducing agemt, pref. formalin, dissolved in vehicle, is applied, before soldering, to positions to be sold...

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1. Verfasser: KUENZIG, HERBERT, 8750 ASCHAFFENBURG
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creator KUENZIG, HERBERT, 8750 ASCHAFFENBURG
description At least one of reducing agents is released as gas after evaporation of the vehicle in soldering process, esp. for printed circuits, in which a flux, consisting of a vehicle, pref. EtOH, and a reducing agemt, pref. formalin, dissolved in vehicle, is applied, before soldering, to positions to be soldered, and where vehicle is evaporated by heat on soldering and the metal oxides and hydroxides are partly reduced and rinsed off. Surface tension of solder may be controlled by providing a higher mol wt. organic halogen-free cpd., esp. succinic anhydride. Pref. flux contains 100 cc 96% EtOH, 0.2 cc formalin (35% HCHO) and 1.5 g succinic acid. No residues are left and bubble inclusions are not formed.
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EtOH, and a reducing agemt, pref. formalin, dissolved in vehicle, is applied, before soldering, to positions to be soldered, and where vehicle is evaporated by heat on soldering and the metal oxides and hydroxides are partly reduced and rinsed off. Surface tension of solder may be controlled by providing a higher mol wt. organic halogen-free cpd., esp. succinic anhydride. Pref. flux contains 100 cc 96% EtOH, 0.2 cc formalin (35% HCHO) and 1.5 g succinic acid. 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language eng ; ger
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source esp@cenet
subjects CLADDING OR PLATING BY SOLDERING OR WELDING
CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING
MACHINE TOOLS
METAL-WORKING NOT OTHERWISE PROVIDED FOR
PERFORMING OPERATIONS
SOLDERING OR UNSOLDERING
TRANSPORTING
WELDING
WORKING BY LASER BEAM
title Soldering esp printed circuits - using flux contg vehicle and reducing agent released as gas after evaporating vehicle
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