Specifications

Appendix-a Cutting & Soldering Transmission Line
November 11, 2013
a‐6
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a.4 Soldering Flanges
Transmissionlineflangesthataresuppliedwiththeoptionaltransmissionlinekitarethesilversoldertype.Although
theattachmentofthistypeofflangemayrequiremorecareandski llthanthesoftsoldertype,ithasbeenfound
thatthesilversoldered flangeprovidesmuchgreaterreliability.Theservices
ofasteamfitterorplumbermaybe
helpfulifpersonnelarenotavailablethatareexperiencedwithsilversoldering.
a.4.1 Soldering Procedure
1. Thelineshouldbefreeofburrs.Theoutercornermaybebeveledslightlytomakeassembly
offlangeeasier.See
Figurea‐8.
2. Emeryclothshouldbeusedtocleantheoutsideofthelinewhereitwillmeettheflange.Also
cleantheinnersurfaceoftheflangewithemerycloth.
3. Insertthesolderringintothegrooveontheflange.Ifsolderringsarenotincludedwiththe
flange,theycanbemadefrom0.062‐inchdiametersilversolderwire(30‐45%silver).
4. Applyathincoatoffluxtothelineandtotheflange.
5. Slidetheflangeontotheendoftheouterconductor.
Warning
SKIN BURN HAZARD. TEMPERATURE OF THE HEATED LINE IN THE FOLLOWING
STEPS IS QUITE HIGH AND PRECAUTIONS MUST BE TAKEN TO AVOID CONTACT
WITH EXPOSED SKIN.
6. Standthelineonend(vertical)forsoldering(flangetobesolderedpointingdown).Ensure
thattheflangeremainssquarewiththeouterconductor.
7. Usinga#3or#4torchtip,heattheentirecircumferenceofthelineandflange.Keepthe
torchmovingandheat2or3inchesoftheline/flangeatatime.Aimthetorchatthecopper
justabovethecrackbetweentheflangeandtheline.Thiswillminimizetheneedforfillsol‐
der.Ifthebrassflangeisheatedmorethanthecopperline,theflangewillexpandandcreate
anunnecessarygaptofillwithsolder.Usecaution.Thereisafinelinebetweenmeltingthe
solderandmeltingthebrassflangeorburningaholeinthecopper.Thesolderwillpullup
intothejointfromthesolderringbycapillaryaction.Onceitstartstoflow,donotstopuntil
theentirecircumferenceofthejointhassolderappearinginit.Ifthesolderfromtheinternal
solderringdoesnot“wickup”andbecomevisibleatthejoint
afterafewminutes,asmall
amountofsoldercanbeappliedtothejointtoenhancetheheattransfer.See
Figurea‐9.