:::RHMT::: Real Home Made Turbo

General Category => Fabrication => Topic started by: walter on October 12, 2009, 01:04:58 PM

Title: why my welds have black colour?
Post by: walter on October 12, 2009, 01:04:58 PM: what tiitle say, i was testing my new TIG and my welds have black colour , it welds 200% better than my ex harbor TIG , y tried with different amp. 30-40-50-60 and 70 , not change.. gas is use is 7-8 litre/minute... not sure what i can't get that sexy colour that someones got when welds..
Title: Re: why my welds have black colour?
Post by: AfroIntegra on October 12, 2009, 01:51:07 PM: It would help if you told us WTF you're welding.
Title: Re: why my welds have black colour?
Post by: walter on October 12, 2009, 02:01:48 PM: lol! forgot that, ss 304 stuff. ill post some pics tonight.
Title: Re: why my welds have black colour?
Post by: t_cel_t on October 12, 2009, 02:23:47 PM: 7-8 liters per min seem like a lot, thats like 60 cubic feet an hour if i know the size of a liter.
you shoudl be using about 15 cubic feet per hour, i think that is like less then a liter per minute
Title: Re: why my welds have black colour?
Post by: walter on October 12, 2009, 02:43:18 PM: Quote from: t_cel_t on October 12, 2009, 02:23:47 PM
7-8 liters per min seem like a lot, thats like 60 cubic feet an hour if i know the size of a liter.
you shoudl be using about 15 cubic feet per hour, i think that is like less then a liter per minute

are u sure? because 15cfm is like 7 lph...
Title: Re: why my welds have black colour?
Post by: t_cel_t on October 12, 2009, 02:47:50 PM: 1 liters = 0.0353146667 cubic feet
1 cubic foot = 28.3168466 liter
15 cubic feet hour = 425L per hour
425 lph/60 mins=7lpm
i was wrong, i didnt know a liter was that small
i was raised in a country where we are accustomed to the ancient way of measuring things
Title: Re: why my welds have black colour?
Post by: CSaddict on October 12, 2009, 03:59:32 PM: Are you using Argon and not a mix? Your bottle may just have contanimated argon. I got one like that. No matter what I did the welds were dirty. Sharp tungsten and clean? Clean material?
Title: Re: why my welds have black colour?
Post by: walter on October 12, 2009, 04:19:01 PM: Quote from: CSaddict on October 12, 2009, 03:59:32 PM
Are you using Argon and not a mix? Your bottle may just have contanimated argon. I got one like that. No matter what I did the welds were dirty. Sharp tungsten and clean? Clean material?

Only ARgon (yellow bottle), ill get another one this saturday, tungsten was new one , cleaned with acetone, samething material..i was testing it only with a 2.5 ss pipe and welds looked black still, ill shoot right now some pics what i means..
Title: Re: why my welds have black colour?
Post by: turbob16hatch on October 12, 2009, 04:25:42 PM: post pictures. NOW

Ok how far were you travling? if you go to far your sheilding gas can not cover the cooling weld bead, and the dark color will happen. Also do you have a gas lense? This is very important on SS if you want pretty welds.
Title: Re: why my welds have black colour?
Post by: walter on October 12, 2009, 04:43:39 PM: no, i have not gas lense yet, ill order one this week.

here some pics, pipe was cleand after i weld, because right now it's dirty..

(https://realhomemadeturbo.com/forum/proxy.php?request=http%3A%2F%2Fimg48.imageshack.us%2Fimg48%2F5128%2Fdscf6537.jpg&hash=d616a73214cfd721e4c6170c56da1d483a2fea6a)

(https://realhomemadeturbo.com/forum/proxy.php?request=http%3A%2F%2Fimg210.imageshack.us%2Fimg210%2F6933%2Fdscf6538.jpg&hash=e7247d66624b71806141799f0dd820bc76bae83d)

(https://realhomemadeturbo.com/forum/proxy.php?request=http%3A%2F%2Fimg169.imageshack.us%2Fimg169%2F5576%2Fdscf6540.jpg&hash=c2060da86195e7d2478f0a55ee738d6139809127)

(https://realhomemadeturbo.com/forum/proxy.php?request=http%3A%2F%2Fimg164.imageshack.us%2Fimg164%2F9420%2Fdscf6541.jpg&hash=4b57140a41fca9f6a128b66d30206723cfc00cf6)

(https://realhomemadeturbo.com/forum/proxy.php?request=http%3A%2F%2Fimg527.imageshack.us%2Fimg527%2F8050%2Fdscf6542e.jpg&hash=ed1c0160960ce1a4197c2566c6b92b7ed5265e0c)

(https://realhomemadeturbo.com/forum/proxy.php?request=http%3A%2F%2Fimg339.imageshack.us%2Fimg339%2F7811%2Fdscf6544.jpg&hash=7826ea14b64b6f23b34d66df8b163d414e261002)

(https://realhomemadeturbo.com/forum/proxy.php?request=http%3A%2F%2Fimg99.imageshack.us%2Fimg99%2F3590%2Fdscf6545.jpg&hash=04361316c4dbd473f46dd9cbd2afbbad0fb434d1)
Title: Re: why my welds have black colour?
Post by: walter on October 12, 2009, 04:46:15 PM: im looking for gas lenses in ebay, not sure what ones will fits with my cups (4-5 is what i use normally)
Title: Re: why my welds have black colour?
Post by: turbob16hatch on October 12, 2009, 05:24:41 PM: did you weld in one step if so that your problem. i weld that long would be about 3-4 stops. depending on your cup size. and a "4-5 cup" is really small. i use a 8 on most everything and would like to get a bigger cup for tubing.

Try welding 3/4 inch then stopping and letting it cool a bit then repeat. this would help.
Title: Re: why my welds have black colour?
Post by: mandrel-bends on October 12, 2009, 05:25:12 PM: That looks like you aren't getting proper flow to the weld. Up your argon flow. Check for flow blockages in the torch. You might also try swapping your tank, you could have a bad tank. Could also be technique, but kind of hard to judge your skills from a picture.
Title: Re: why my welds have black colour?
Post by: CSaddict on October 12, 2009, 06:39:30 PM: Looks too hot or you are moving too slow.
Title: Re: why my welds have black colour?
Post by: weirtech on October 12, 2009, 08:20:33 PM: 1. it looks like you could have cleaned the material better. use a stainless steel wire brush.
2. it looks like your amperage is too high (too hot).
3. having a gas lense will help.
4. it looks like you aren't adding enough filler in a couple of the pics, try adding even more so the weld is more raised.
Title: Re: why my welds have black colour?
Post by: walter on October 13, 2009, 02:40:00 PM: thx for replies.

turbob16hatch , you means weld 19-20mm and stop?

Adam, ill try to up the flow a bit and will check if it's better this days.

CSaddict , idk how slow i weld but i think after to watched some videos about welding, i dont weld so slow..i have to melt filler with material... ill try to get dow the amperage.

Aaron, this time, i didnt clean it with wire brush,only with acetone, and some pics of welds i posted , i welded without filler..

ill try this days to weld it again cleaning it better ,up a bit the flow and down amperage a bit.
Title: Re: why my welds have black colour?
Post by: t_cel_t on October 13, 2009, 07:11:27 PM: also check the collet, i think some torches allow you to put them in backwards and they block the argon from coming through
Title: Re: why my welds have black colour?
Post by: walter on October 14, 2009, 08:55:15 AM: Quote from: t_cel_t on October 13, 2009, 07:11:27 PM
also check the collet, i think some torches allow you to put them in backwards and they block the argon from coming through

what is the collet?
Title: Re: why my welds have black colour?
Post by: t_cel_t on October 14, 2009, 01:38:02 PM: the little brass piece that falls out of the torch if you take the endcap off, the tungsten goes through it and it clamps down on it to hold it in place. some torches you can have it in backwards.
Title: Re: why my welds have black colour?
Post by: bigwig on October 14, 2009, 09:35:09 PM: http://www.fortunecity.com/village/lind/247/weld_book/fig5-22.gif (http://www.fortunecity.com/village/lind/247/weld_book/fig5-22.gif)
Title: Re: why my welds have black colour?
Post by: walter on October 15, 2009, 06:46:47 PM: Quote from: bigwig on October 14, 2009, 09:35:09 PM
http://www.fortunecity.com/village/lind/247/weld_book/fig5-22.gif (http://www.fortunecity.com/village/lind/247/weld_book/fig5-22.gif)

pic doesnt work. but i think i know what it's.

i got new stuff from Adam today! ill make another exhaust system for a VW GT 1.4 turbo/supercharger stock! :o
Title: Re: why my welds have black colour?
Post by: walter on October 26, 2009, 06:11:13 PM: Got Gas lens today, didnt fits, not sure what should works with my tig >:(

(https://realhomemadeturbo.com/forum/proxy.php?request=http%3A%2F%2Fi33.tinypic.com%2F2w4d8i8.jpg&hash=083b88c003db7bbd6e5122f3caf68ff723889bfb)

(https://realhomemadeturbo.com/forum/proxy.php?request=http%3A%2F%2Fi33.tinypic.com%2F11j9a41.jpg&hash=0a109e5aa6fef4f2860b92e434899273c7df44e8)
Title: Re: why my welds have black colour?
Post by: CSaddict on October 26, 2009, 08:20:00 PM: You need gas lens specific cups.
Title: Re: why my welds have black colour?
Post by: walter on October 27, 2009, 09:43:48 AM: seller said me that looks i use 17 series torch, i dont know what toch i use exactly :-\ that's why i got them wrong.
Title: Re: why my welds have black colour?
Post by: walter on October 27, 2009, 09:49:10 AM: i checked , in the torch , says TIG 26 , ill order for 26 series torch today!
Title: Re: why my welds have black colour?
Post by: walter on November 05, 2009, 05:07:13 PM: it's ready. ill try to test it by tomorrow!
Title: Re: why my welds have black colour?
Post by: crxvtec91 on November 05, 2009, 05:28:51 PM: Post pic's.
Title: Re: why my welds have black colour?
Post by: walter on November 07, 2009, 12:54:41 PM: not luck yet, i was using 8 cap with gas lens, too big to me..

tried with 6cup, weld looks a bit small and looks ok to me that size but colour .. sameshit.

i only made a weld with nice colours, all rest, same colour, i dont get that sweet colour on tig welds.

here some pics.

(https://realhomemadeturbo.com/forum/proxy.php?request=http%3A%2F%2Fi34.tinypic.com%2F28wcr6h.jpg&hash=0c2a25f730382ffcff33ed5a69003edae3285a0a)

(https://realhomemadeturbo.com/forum/proxy.php?request=http%3A%2F%2Fi36.tinypic.com%2F2q3vr5k.jpg&hash=d0fc4927d84e579340fcfb7df2bc8f1562715e96)

this is the "best colour" i got.

(https://realhomemadeturbo.com/forum/proxy.php?request=http%3A%2F%2Fi34.tinypic.com%2Fzx1ge8.jpg&hash=d82b4ffceec03b940a066cfa833dfa1e00bd54a7)

(https://realhomemadeturbo.com/forum/proxy.php?request=http%3A%2F%2Fi38.tinypic.com%2F2nbf0g2.jpg&hash=681c16984ee6b3348166429f933f9bbfb94d556a)

I was looking for 3M pads and found one , cutted as disc and works perfect.

even after clean with 3M pad, used acetone for clean it, idk what im doing wrong.

I tried with 25-30-35 amp (i assume digital numbers that shows my tig welder are amp) and flow from 6-10 lpm, it's something like from 13cfm up to 21cfm.

not sure what is happening :'(
Title: Re: why my welds have black colour?
Post by: turbob16hatch on November 08, 2009, 11:01:40 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.
Title: Re: why my welds have black colour?
Post by: t_cel_t on November 09, 2009, 04:14:06 AM: can you hook up your old machine and try a pass, or do you have any pics of stainless welds with the old welder?
Title: Re: why my welds have black colour?
Post by: walter on November 09, 2009, 08:49:49 AM: Quote from: turbob16hatch on November 08, 2009, 11:01:40 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.
Title: Re: why my welds have black colour?
Post by: slappynuts 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.
Title: Re: why my welds have black colour?
Post by: turbob16hatch on November 09, 2009, 01:30:31 PM: Quote from: slappynuts 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.

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.
Title: Re: why my welds have black colour?
Post by: slappynuts on November 09, 2009, 01:57:09 PM: wastegate fell off ;)
Title: Re: why my welds have black colour?
Post by: turbob16hatch on November 09, 2009, 01:59:02 PM: Quote from: slappynuts on November 09, 2009, 01:57:09 PM
wastegate fell off ;)

?
Title: Re: why my welds have black colour?
Post by: slappynuts 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?
Title: Re: why my welds have black colour?
Post by: walter on November 09, 2009, 02:30:48 PM: so? ???
Title: Re: why my welds have black colour?
Post by: turbob16hatch on November 09, 2009, 02:32:41 PM: Quote from: walter on November 09, 2009, 02:30:48 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.
Title: Re: why my welds have black colour?
Post by: walter 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 :-\
Title: Re: why my welds have black colour?
Post by: slappynuts on November 16, 2009, 12:11:56 AM: What angle is your torch to the piece your welding?
Title: Re: why my welds have black colour?
Post by: walter on November 17, 2009, 10:03:36 AM: i tried with everything, what angle should i try? what amps you use for welding 16gauge?
Title: Re: why my welds have black colour?
Post by: walter 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.

(https://realhomemadeturbo.com/forum/proxy.php?request=http%3A%2F%2Fi50.tinypic.com%2Fny8u14.jpg&hash=4b2f16e148390018d86336cc1373a1db6b27dda3)

(https://realhomemadeturbo.com/forum/proxy.php?request=http%3A%2F%2Fi46.tinypic.com%2F27xe99y.jpg&hash=4ccde8ba0a5954cf4ea86ecc6014622c5ada987e)

(https://realhomemadeturbo.com/forum/proxy.php?request=http%3A%2F%2Fi45.tinypic.com%2F2mlm6g.jpg&hash=01dc276e9e6f2a41864291fb85960bd2e4a511fc)