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Soudage à la cire


Salutation à tous !!!

Je suis là pour vous parler d’une technique pour coller vos pièces.  A l’origine, je cherchais un moyen simple de coller mes assemblages efficacement, simplement, avec le moins possible de produit chimique et pas trop chère. J’ai déjà utilisé la cire lors de moulage à la… cire perdu 😀 . Je me suis donc lancé dans une petite expérience pour voir si la cire ferait une bonne colle.

Expérimentons !!!

J’ai commencé par coller deux pièces que j’avais en stock.


Les deux pièces ensemble forment un triangle. La soudure est au niveau des deux angles inférieurs. L’assemblage est une surface lisse contre une autre surface lisse. Il n’y a donc pas de surface mécanique pour faciliter l’accroche. J’ai fixé une bouteille d’eau à la pièce inférieure. En remplissant la bouteille progressivement j’ai pu tester la résistance à la traction de la soudure.


Poids Soudure intacte
30g OK
50g OK
100g OK
150g OK
200g NON OK


La pièce s’est décrochée à 200 grammes. Même les colles bas de gamme sont plus efficaces. J’ai ensuite renouvelé l’expérience avec un assemblage plus efficace. J’ai imprimé deux petites pièces rectangulaires qui s’imbriquent.


Cet assemblage met plus de surface en contact et le jeu entre les pièces est de 0.5 mm. Et hop j’accroche la bouteille.

Poids Soudure intacte
200g OK
250g OK
300g OK
400g OK
500g OK
600g OK
700g OK
800g OK
900g OK
1000g OK
1500g OK
2000g OK


Nous avons une résistance digne de très bonne colle industrielle. Ces meilleurs résultats sont expliqués par le sens de travail de la cire. Dans le premier cas, la cire travail en décollement. Les deux parties vont en s’éloignant. La cire s’étire puis se rompt. Dans le deuxième cas, la cire travaille en cisaillement. Les deux pièces se déplacent en glissant l’une contre l’autre. La cire est mis en compression et empêche le décollement.

Et petit conclusion (soyons fou)

La conclusion est que la cire, comme la plupart des colles, est plus efficace quand nous prêtons attention à la forme de l’assemblage. Mais alors pourquoi utiliser la cire ? La cire a des propriétés que les colles n’ont pas.

  • ne sèche pas à l’air
  • ne craint pas l’humidité
  • peut se stocker quasi indéfiniment
  • ne contient pas de produits chimiques volatiles et toxiques
  • ne coûte pas cher
  • ne demande que de la chaleur pour être utilisé (les bougies sont carrément livrées avec une mèche pour faire fondre la cire… cool non 🙂 )

Quelques propriétés de la cire

La cire à un point de fusion de 70°C ce qui est assez bas pour ne pas déformer le plastique d’imprimante 3D (200 degrés en moyenne pour que le PLA fonde). Mais la température de combustion est plus proche des 1200°C. Donc si vous faites un bougeoir, ne mettez pas en contacte le plastique et la flamme  😆 .

Pensez aussi que la cire exposée directement au soleil d’été de la Provence devient molle, sans se liquéfier. Si vous utiliser la cire pour des objets en extérieur, mettez la cire à l’ombre surtout dans les pays chaud. Il est assez facile de concevoir son assemblage pour cacher la cire au soleil, trop chaud. Pour ceux qui : l’été ne rime pas avec 40°C (ou plus 😎 ) à l’ombre. Vous n’aurez aucun problème.

Si vous avez des questions, je suis toujours disponible. A la prochaine fois !!!!!


Partagez et suivez nous

30 commentaires sur Soudage à la cire

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