{"id":3714,"date":"2026-07-29T08:28:46","date_gmt":"2026-07-29T16:28:46","guid":{"rendered":"https:\/\/dez-smt.com\/?page_id=3714"},"modified":"2026-08-29T03:49:59","modified_gmt":"2026-08-29T11:49:59","slug":"through-hole-selective-soldering","status":"publish","type":"page","link":"https:\/\/dez-smt.com\/pt\/applications\/through-hole-selective-soldering\/","title":{"rendered":"Otimiza\u00e7\u00e3o de Soldagem Seletiva para Montagem THT | DEZ"},"content":{"rendered":"\n
<\/div>
\n
\n

Selective Soldering Optimization<\/h1>\n\n\n\n
Through-hole connectors, terminals, relays, transformers and other leaded components often remain after SMT reflow. Manual soldering can create inconsistent solder volume and cycle time, while conventional wave soldering may expose areas that do not require soldering.<\/div>\n\n\n\n
Selective soldering applies flux, preheats the assembly and solders programmed through-hole joints with a controlled mini-wave. DEZ provides offline and inline systems for different PCB dimensions, production volumes and automation requirements.<\/div>\n\n\n\n
\nRequest Sample Soldering<\/a>\n<\/div>\n<\/div>\n <\/div><\/div>\n\n\n\n
\n
\n

Problems Solved by Selective Soldering<\/h2>\n\n\n\n
\n
\n
\n
\n

Inconsistent Manual Soldering<\/h2>\n\n\n\n
Programmed fluxing and soldering reduce variation caused by manual movement, contact time and solder feeding.<\/div>\n<\/div>\n <\/div><\/div>\n<\/div><\/div><\/div>\n\n\n\n
\n
\n
\n

Through-Hole Components on Mixed SMT\/THT PCBAs<\/h2>\n\n\n\n
Selected joints can be soldered without passing the entire underside of the assembly over a full-width solder wave.<\/div>\n<\/div>\n <\/div><\/div>\n<\/div><\/div><\/div>\n\n\n\n
\n
\n
\n

Insufficient Through-Hole Solder Fill<\/h2>\n\n\n\n
Controlled flux volume, preheating, nozzle movement and solder contact time help improve solder flow through plated holes.<\/div>\n<\/div>\n <\/div><\/div>\n<\/div><\/div><\/div>\n\n\n\n
\n
\n
\n

Solder Bridging Between Adjacent Pins<\/h2>\n\n\n\n
The soldering path, nozzle size, travel direction and separation settings can be adjusted for closely spaced connector pins.<\/div>\n<\/div>\n <\/div><\/div>\n<\/div><\/div><\/div>\n\n\n\n
\n
\n
\n

Uneven Heating on High-Thermal-Mass Assemblies<\/h2>\n\n\n\n
Preheating prepares thick PCBs, ground planes, terminals and large components before they contact the solder wave.<\/div>\n<\/div>\n <\/div><\/div>\n<\/div><\/div><\/div>\n\n\n\n
\n
\n
\n

Excess Flux Outside the Soldering Area<\/h2>\n\n\n\n
Selective flux application places flux only where through-hole joints will be soldered.<\/div>\n<\/div>\n <\/div><\/div>\n<\/div><\/div><\/div>\n\n\n\n
\n
\n
\n

Frequent Product Changeovers<\/h2>\n\n\n\n
Stored programs allow different PCBAs, soldering coordinates and process settings to be recalled for repeat production.<\/div>\n<\/div>\n <\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>
<\/div>
<\/div>
<\/div>
<\/div><\/div><\/div>\n<\/div>\n <\/div><\/div>\n\n\n\n
\n
\n

Where Selective Soldering Is Used<\/h2>\n\n\n\n
\n
\n
\n
\n
\n\n
\n
\n
\n
Automotive Electronics<\/div>\n\n\n\n

Used for ECUs, lighting controllers, charging modules and sensor assemblies containing connectors, terminals and other through-hole components.<\/p>\n<\/div>\n\n\n\n

<\/div>\n<\/div>\n<\/div>\n\n\n\n\"Automotive-Electronics-SMT-1\"\n<\/a>\n<\/div>\n<\/div>\n <\/div><\/div>\n<\/div><\/div><\/div>\n\n\n\n
\n
\n
\n
\n\n
\n
\n
\n
Medical Electronics<\/div>\n\n\n\n

Used for diagnostic, monitoring and control assemblies combining surface-mount circuits with through-hole connectors and electromechanical components.<\/p>\n<\/div>\n\n\n\n

<\/div>\n<\/div>\n<\/div>\n\n\n\n\"Medical\n<\/a>\n<\/div>\n<\/div>\n <\/div><\/div>\n<\/div><\/div><\/div>\n\n\n\n
\n
\n
\n
\n\n
\n
\n
\n
Aerospace and Defense Electronics<\/div>\n\n\n\n

Used for complex, low-to-medium-volume assemblies requiring controlled soldering of selected through-hole joints.<\/p>\n<\/div>\n\n\n\n

<\/div>\n<\/div>\n<\/div>\n\n\n\n\"Aerospace-&-Defense-Electronics\"\n<\/a>\n<\/div>\n<\/div>\n <\/div><\/div>\n<\/div><\/div><\/div>\n\n\n\n
\n
\n
\n
\n\n
\n
\n
\n
Industrial Control Equipment<\/div>\n\n\n\n

Used for PLC boards, motor drives, control modules and power supplies containing relays, transformers and terminal blocks.<\/p>\n<\/div>\n\n\n\n

<\/div>\n<\/div>\n<\/div>\n\n\n\n\"Industrial\n<\/a>\n<\/div>\n<\/div>\n <\/div><\/div>\n<\/div><\/div><\/div>\n\n\n\n
\n
\n
\n
\n\n
\n
\n
\n
Telecommunications Equipment<\/div>\n\n\n\n

Used for communication power boards, network equipment and control assemblies containing large connectors and mixed SMT\/THT components.<\/p>\n<\/div>\n\n\n\n

<\/div>\n<\/div>\n<\/div>\n\n\n\n\"Telecommunications\n<\/a>\n<\/div>\n<\/div>\n <\/div><\/div>\n<\/div><\/div><\/div>\n\n\n\n
\n
\n
\n
\n\n
\n
\n
\n
LED and Power Electronics<\/div>\n\n\n\n

Used for inverters, charging systems, power modules and power supplies containing high-current connectors, inductors and large through-hole joints.<\/p>\n<\/div>\n\n\n\n

<\/div>\n<\/div>\n<\/div>\n\n\n\n\"LED\n<\/a>\n<\/div>\n<\/div>\n <\/div><\/div>\n<\/div><\/div><\/div>\n\n\n\n
\n
\n
\n
\n\n
\n
\n
\n
EMS and Contract Manufacturing<\/div>\n\n\n\n

Used for different customer PCBAs with changing board sizes, soldering coordinates, component layouts and production volumes.<\/p>\n<\/div>\n\n\n\n

<\/div>\n<\/div>\n<\/div>\n\n\n\n\"EMS\n<\/a>\n<\/div>\n<\/div>\n <\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>
<\/div>
<\/div>
<\/div>
<\/div><\/div><\/div>\n<\/div>\n <\/div><\/div>\n\n\n\n
\n
\n
<\/div>

Recommended Selective Soldering Equipment<\/h2>\n\n\n\n
It is suitable for continuous production requiring separate process stations and stable cycle control.<\/div>\n<\/div>\n\n\n\n
\n
View All SMT Equipment<\/span><\/span>\n <\/path>\n<\/svg><\/span><\/span><\/a><\/div>\n<\/div>\n <\/div><\/div>\n\n\n\n