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Author Topic: why my welds have black colour?  (Read 7916 times)

walter

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Re: why my welds have black colour?
« Reply #30 on: November 09, 2009, 08:49:49 AM »

you care to post up a pic of your torch? you could have a leak in the torch. It happened to me when i was pulling it apart a bunch to swap cups from breaking them doing al work. i was slightly unscrewing the gas lense every cup change.

check for leaks at the torch head.

ill check it!

Cel, ill post some pics of torch today.

ABout pics, what do you need some pic of the old machine? i sold it already.
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slappynuts

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Re: why my welds have black colour?
« Reply #31 on: November 09, 2009, 10:47:28 AM »

Turn down the juice and go slower. Way to hot and wayyyy to fast. If you weld out to the edge of your cup and let the weld cool while its under the cup it will not turn black.
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turbob16hatch

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Re: why my welds have black colour?
« Reply #32 on: November 09, 2009, 01:30:31 PM »

Turn down the juice and go slower. Way to hot and wayyyy to fast. If you weld out to the edge of your cup and let the weld cool while its under the cup it will not turn black.

Ok for one he said he was running 20-30-35 amps which is cold as shit if that is machine settings. I set mine at 60 amps and use 80% maybe and i have no issues with gas coverage.

OP, just judging by the HAZ it looks like you never stopped when doing each string of weld. Which is a huge no no. You need to stop about every 1/2 to 3/4's of an inch depending on the cup size. This allows the metal to cool a bit for one, and allows you to not go beyond the coverage abilities of your cup. the only way you could weld a long distance is if you had a massive cup or ran a trailing purge set up.

slappy how would you weld slower and colder them 35 amps on a damn 16g tube? do you not care for penetration? It would take me days to build a downpipe welding at those amps.
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slappynuts

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Re: why my welds have black colour?
« Reply #33 on: November 09, 2009, 01:57:09 PM »

wastegate fell off  ;)
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turbob16hatch

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Re: why my welds have black colour?
« Reply #34 on: November 09, 2009, 01:59:02 PM »

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slappynuts

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Re: why my welds have black colour?
« Reply #35 on: November 09, 2009, 02:18:07 PM »

Im not about draging people through the mud like you have tried to do to me in the past. It does nothing for either of us to bicker like this.

Alot of the welds I am seeing here are very close to burning through. What kind of welder are you using?
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walter

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Re: why my welds have black colour?
« Reply #36 on: November 09, 2009, 02:30:48 PM »

so?  ???
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turbob16hatch

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Re: why my welds have black colour?
« Reply #37 on: November 09, 2009, 02:32:41 PM »

so?  ???

Well try doing what i said, stop every 1/2 to 3/4 of an inch. and let the part cool for a bit before welding on it again. ( take a 2 min break between weld sections)

try this and post up a picture.
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walter

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Re: why my welds have black colour?
« Reply #38 on: November 15, 2009, 06:52:45 PM »

i tried it for 2 min right now (here is to late for practice welding) but i dont get that shit gets colour..

i down amp to 20 and i can't melt even the rods i have to up for melt atlest rods and a bit more up for melt the tube , i dont know what the hell to do  >:(

i will practice more tomorrow.  >:( after the buy better stuff i get same shit than my Harbor TIG  :-\
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slappynuts

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Re: why my welds have black colour?
« Reply #39 on: November 16, 2009, 12:11:56 AM »

What angle is your torch to the piece your welding?
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walter

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Re: why my welds have black colour?
« Reply #40 on: November 17, 2009, 10:03:36 AM »

i tried with everything, what angle should i try? what amps you use for welding 16gauge?
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walter

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Re: why my welds have black colour?
« Reply #41 on: November 19, 2009, 05:53:41 PM »

thx for help  :?:

today i have a bit free time for practice tig welding.

i think need bigger cup, im using 8cup w gas lens of course.





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