Laser Tranmission Welding

7/23/2019 Laser Tranmission Welding

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WHAT IS LASER TRANSMISSION

WELDING?Laser transmission welding is a new

method of oining thermo!lasti"s#

It is also a "ost e$e"ti%e te"hni&'e of oining of thermo!lasti"s when

"om!ared to other te"hni&'es whi"hin%ol%e s"rews or adhesi%es#



(RIN)I(LE O* L#T#W# The oining !ro"ess in laser welding is +ased

on "on%erting radiant energ, into heat %ia itsa+sor!tion within the material- gi%ing lo"almelting in the oining region#

There are . im!ortant re&'irements in theL#T#M/

0# '!!er transmissi%e material 1#lower a+sor!tion material

.#"lam!ing de%i"e for a!!l,ing !ress're



(RIN)I(LE O* L#T#W#



(RIN)I(LE O* L#T#W#laser +eam !enetrates the '!!er material and

is a+sor+ed +, the lower material th's heating'! the lower la,er dire"tl,#

This la,er trans!orts the heat indire"tl, %iaheat e2!ansion and "ond'"tion to the '!!erla,er so that +oth materials are

sim'ltaneo'sl, heated '! and melted## A!!l,ing e2ternal !ress're leads to a

strength of the welded material whi"h almoste&'als that of the +ase material



Welding !arameters The main !arameter whi"h will a$e"t the

weld and +ond &'alit, are/

the laser !owerwelding s!eed

laser +eam si3e

"lam!ing !ress're



When the in"ident laser intensit, is too low- a!oor &'alit, weld with !ores in the "enter ofthe weld was o+tained#

When the laser intensit, is too high thene2"essi%e heat in the oint res'lts in material

degradation#



AD4ANTAGES O* L#T#W#No me"hani"al stress on the moldings

Small amo'nts of heat a!!lied to a limited

area(arts with di$erent sti$ness are welda+le

Non/"onta"t 5no melt ta"6- no mar6ings onmoldings7

Materials of di$erent %is"osities "an +ewelded

4irt'all, no erosion !ro"ess

Re!air welds !ossi+le



)ONDITIONS *OR L#T#W# The oining materials sho'ld not +e of same

molding material or +oth sho'ld not +etrans!arent#

some fa"tors also a$e"t the le%el oftransmittan"e/

/Thi"6ness of the !lasti"s / 8llers li6e glass 8+ers

/ )olo'r additi%es



E**E)T O* )OLO9R )OM:INATIONS O* MATERIALS



L#T#W# TO ;OIN TRANS(ARENT TO

TRANS(ARENT MATERIALS

This is the main area to research.

Very difcult with simple L.T.W.

Up to now there have two methods been developed-

1)By opin! The "dditives #n The #nter$ace

%)By usin! the hi!h wave len!th o$ laser



0# :, do!ing the additi%es in the

interfa"ea s!e"ial additi%e m'st +e either do!ed into

the lower la,er material#

This "oating or additi%es allow for o!ti"altransl'"en", while !ro%iding a+sor!tion forthe laser#

This is mostl, di="'lt d'e to the high !ri"e of

some s!e"ial additi%es and the a!!li"ation!ro"esses#



1# :, 'sing the high wa%e length of

laserIn this method 'sing

a higher wa%elength laser it is !ossi+le tofo"'s the maorit, of the laser energ, at theinterfa"e of the two !arts and a"hie%e getgood !re"ision weld witho't an, additi%e#

:'t the weld &'alit, will not +e e="ient#



T&"'( *U

Laser Tranmission Welding

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