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Silver soldering a bandsaw blade

Very often, a bandsaw breakage is felt as a fate that inevitably leads to the replacement of the blade.

It is however so simple to solder it back, using silver brazing. It is actually extreamly tough, so that the next breakage will probably not happen at the solded joint, if the weld is properly done.

Soldering does not require much equipment. The blade is not very massive and does not need a big heating power for reaching a high temperature. A simple butane soldering torch, even a little torch like the one used for cooking (do you know the french "Crème brûlée ?"  smile) can be enough.

I personnaly use some silver based brazing sticks that you can find in any hardware store. The greater silver proportion you use, the stronger the weld will be.

The following document is a method found on the internet. The document also describes the making of a fixture to do so.

It is available in the  download section.

 

 

In addition to this method, here are some illustrations that can be more explicit, taken from  another document :

  • The way to fold the blade if you want to grind a straight joint (this is enough for the widest blades, it is not necessary to make a bevel for the blades that are the thickest) :

 

  • The way to grind a bevel, on the smallest blades, stacking the two ends of the blade. That way you can have exactly mated bevels that will assemble perfectly :

 

  • and eventually, for those that have metal milling capacity, another shape, more compact, for the fixture :

 

 

Feel free to comment.

Christophe.

 




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Creation date : 17/06/2013 : 16:17
Last update : 17/06/2013 : 17:17
Category : - Workshop
Page read 22167 times


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Reaction #2 

by wperrad 21/08/2014 : 16:44

Bonjour, merci pour votre article intéressant,  j'ai cassé une lame récemment et je voudrais savoir si on peut utiliser un chalumeau au propane a la place du butane ? Merci !

-------------------------------------------------------------------------------------------------------------------------------------------

Bonjour, 

oui, bien sûr, la chaleur nécessaire pour la brasure à l'argent n'est pas extrêmement élevée, et la puissance de la flamme pour souder  une lame de ruban n'a pas besoin non plus d'être très importante.

Dans le kit du commerce pour réparation de lame, le chalumeau qui est fourni est un petit chalumeau à gaz de briquet qui sert normalement à préparer les crèmes brûlées smile

Cordialement

Christophe


Reaction #1 

by PETON 01/08/2013 : 11:58

Bonjour,

Merci pour vos explications pour la soudure des lames de scies a ruban pour le bois

Pourriez vous m'indiquer ou trouver de la soudure a l'argent ?

Que signifie le terme GSB ?

Je vous remercie

et encore bravo pour votre article

Jean Peton

 

_________________________________________________________________

Bonjour, merci pour votre message, gsb c'est le termre souvent usité sur les forums pour grande surface de bricolage, mais vous avez raison, j'aurais du preciser. Donc chez mr bricolage ou similaire, au rayon soudure, il y en a toujours, ne pas hésiter à prendre un fort pourcentage en argent, 30 ou 40 pour cents. Cordialement, je mettrai votre message et sa réponse d'ici 15 jours, je suis loin de mon clavier wink
Christophe
 
__________________________________________________________________
 
Bonjour et merci pour votre réponse

Demain , je vais essayer de trouver des baguettes, aujourd'hui je n'ai pas réussi !
je vous tiendrai au courant

Encore merci

 Jean

 


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