The brochure contains information on the compositions, properties of various solders and fluxes used in the industry for soft and hard soldering, as well as their areas of application. It addresses general issues of soldering technology for both hard and soft solders and describes the most common equipment. The brochure is intended for young professionals who have graduated from educational institutions of labor reserves and work in the field of soldering. It can be useful for masters of industrial training and teachers of schools and schools of labor reserves, as well as for everyone interested in soldering issues.