Post a pic up of your best welds

[Gin Kii]

man I've fucked some drill bits drilling that shit and bisalloy

Masonary bit in a drill press. Turn it at 11ty billion rpm... use WD-40 for lube and hold firm pressure on the material and as the bit heats up it will pop through like a hot knife through butter. 1 bit is good for 4 holes.

[Commotion]

Gotta keep that in mind for emergencies. if we need a hole we normally cut it out with the oxy.
Even weldox is pretty tough, got shit for ruining a bandsaw blade cutting Weldox. Mag drill will punch through it easy enough tho.

This q&t steel is great stuff. Just need those muppets to update the Australian standards to account for them in the fatigue life calcs. According to the codes the notch stress takes no consideration for yield strength yet many experts have acknowledged that this stuff has a much greater fatigue resistance. (Weak engineer whinge 1/10)

[dnegative]

We put some bisslloy strip in with the regular steel in the rack at work, you knew someone had tried to use it when the drill press was howling from someone trying to rub their way through with a drill lol

Brand new HSS bit works for 1/8 of an inch then its fuckef

[Gin Kii]

Gotta keep that in mind for emergencies. if we need a hole we normally cut it out with the oxy.
Even weldox is pretty tough, got shit for ruining a bandsaw blade cutting Weldox. Mag drill will punch through it easy enough tho.

In emergencies I do up to 10mm holes (never need anything bigger) in SSAB Armox 600 with the old spin the cunt outta the masonry bit and let it melt through routine... anything Hardox is easy, grab some scrap and give it a try.

weldox Ive never used, is it harder than Hardox ?

[schnoods]

Masonary bit in a drill press. Turn it at 11ty billion rpm... use WD-40 for lube and hold firm pressure on the material and as the bit heats up it will pop through like a hot knife through butter. 1 bit is good for 4 holes.

I just get an oxy set and heat up the area where the hole is to be drilled and get it orange, let it cool and dill the local area on a low speed with a lot of grunt in the radial arm drill. Plenty of coolant and a good bit can drill quite a few holes.

[Commotion]

Weldox or strenx as they now call it is only 700MPa so bis 80 equivalent.

[E30is]

Gotta keep that in mind for emergencies. if we need a hole we normally cut it out with the oxy.
Even weldox is pretty tough, got shit for ruining a bandsaw blade cutting Weldox. Mag drill will punch through it easy enough tho.

This q&t steel is great stuff. Just need those muppets to update the Australian standards to account for them in the fatigue life calcs. According to the codes the notch stress takes no consideration for yield strength yet many experts have acknowledged that this stuff has a much greater fatigue resistance. (Weak engineer whinge 1/10)

most fabrications crack at the weld toe or in the throat depending on joint design/loading and higher yield strength actually doesn't change that very much. there are very good reasons why you aren't allowed to claim benefits from high strength steels its not just an AS thing. even away from welds there are things introduced by manufacturing processes that mean you dont realize the full benefit of the strength like you would with a "perfect" mirror polished specimen in a lab rotating beam test etc where the UTS is relevant.

[Commotion]

While what u say is generally true, an old work colleague went to a fatigue conference last year and apparently there is a push for q&t steels in the ship building industry for obvious reasons. They had industry doing test specimens for fatigue tests and the results were showing substantial increases in endurance limits of the joints.

This old work colleague was an import and most of his career had been dealing with eurocodes. Most of the Australian standards are copy and pasted from the eurocodes. He was showing me specific examples and in most cases they don't copy the full text and leave out parts. One example is in 4100 in the weld strength calculation the procedures is that for a weld in shear (worst case) with no consideration made for the weld loaded any other way. The leave out the part from the eurocodes where a weld in tension is calculated via a plane through the weld at an angle other than 45 deg. I can't remember the exact angle but I think it was around 35 deg. He ran a detailed Fea analysis of a simulated weld joint and demonstrated the plastic strain forming on a plane through the weld at very much this angle. This substantially increases the capacity of the joint but the AS neglect this. There were plenty of other examples he shown me but no point clogging up the thread and most of the. I have forgotten now anyway.

Enough chit chat. I did some more work on that fabrication today and took a photo:

[E30is]

While what u say is generally true, an old work colleague went to a fatigue conference last year and apparently there is a push for q&t steels in the ship building industry for obvious reasons. They had industry doing test specimens for fatigue tests and the results were showing substantial increases in endurance limits of the joints.

This old work colleague was an import and most of his career had been dealing with eurocodes. Most of the Australian standards are copy and pasted from the eurocodes. He was showing me specific examples and in most cases they don't copy the full text and leave out parts. One example is in 4100 in the weld strength calculation the procedures is that for a weld in shear (worst case) with no consideration made for the weld loaded any other way. The leave out the part from the eurocodes where a weld in tension is calculated via a plane through the weld at an angle other than 45 deg. I can't remember the exact angle but I think it was around 35 deg. He ran a detailed Fea analysis of a simulated weld joint and demonstrated the plastic strain forming on a plane through the weld at very much this angle. This substantially increases the capacity of the joint but the AS neglect this. There were plenty of other examples he shown me but no point clogging up the thread and most of the. I have forgotten now anyway.

went to a few conferences myself and have used BS, AS, eurocode and IIW, they each have the same basic approach and usually valid upto approx 700MPa or so from memory. cant see them changing to give any big increases due to better grade of parent plate.

i have seen one american standard that allowed it, buy you're talking at most 20% higher fatigue limit for a material that is twice as strong yield wise and thats only for full pen butt welds..

[Commotion]

Fair enough.

The biggest trouble i have always had with fatigue is getting an accurate load history. Previous place of employment wanted fatigue analysis done on the stuff we were designing and they couldn't give us any data. Just pulling ridiculous load factors out of thin air (in the order of ±3 time static fully laden load). In the end we didn't end up doing any analysis because there was no way the design would pass with those magnitudes of load.

[bang chong]

finally gave my new tig a whirl and I'm very happy with it. Was playing around with the hot start function hence why I had a spot missing on my practice piece. Highly recommend the everlast 210ext if you're in the market for a ac/dc single phase tig

[Nacho]

LOL

[BeverlyHillsCop]

finally gave my new tig a whirl and I'm very happy with it. Was playing around with the hot start function hence why I had a spot missing on my practice piece. Highly recommend the everlast 210ext if you're in the market for a ac/dc single phase tig

Yup, Have a PowerTIG 210 EXT myself... nothing but praise from my end with the unit.... dont post on US Welding forums about it though... you'll get told to take your chinese welder and piss off cos its not a Miller or Lincoln lol

[bang chong]

Yup, Have a PowerTIG 210 EXT myself... nothing but praise from my end with the unit.... dont post on US Welding forums about it though... you'll get told to take your chinese welder and piss off cos its not a Miller or Lincoln lol

Funny you say that, we have two millers at work(one being the latest model) and there is no difference with welding compared to the everlast. Except the better pedal and torch that the miller have but that was all extras anyways.

Sent from my SM-G925I using Tapatalk

[snavy]

Let me guess...little 220V 140A hobby shop/home store welder?

They simply aren't made to really "run" gas, they're optimized for flux-core wire and can't really push the power that solid wire needs. Not really that they can't provide the current, just that the voltage regulation isn't as good as it really should be. The flux-core wire has less metal in it, so it melts faster, plus the vaporization of the flux core helps get more heat into the wire. Deposition rate goes up for the same current/voltage, so wire speed has to go up, too. Also, Flux-core is configured (normally) as Electrode-positive. This also heats the wire more than it heats the base metal.

Now, as to why the penetration is *better* with gas welding, is because gas-shielded MIG welding is done with Electrode Negative polarity. In this configuration, the heat is focused on the base metal more than the electrode metal. The most heat energy is transferred to the weld puddle in EN, and this hot puddle melts deeper into the base metal. When the polarity is switched to EP, (as is used with flux-core wire), then the major part of the heat energy is focused on the electrode, and this makes the weld puddle cooler and less penetrating than on EN, Also heat energy is dissipated through the electrode into the shielding gas and electrode holder.

I changed over to .6 wire after reading your advise. Definitely welds better imo. In relation to not seeing properly I found the welding mask it came with. I used it one thing I noticed immediately is its not blurry. Darkness is slightly lighter than my helmet and more importantly it's not blurry like my helmet! Wtf my helmet is like looking through prescription glasses!