What an Arc Welding Procedure Handbook Actually Is
A Procedure Handbook Of Arc Welding is just a written record of how to weld something without it falling apart later. It lists the parameters—current, voltage, travel speed, electrode choice, preheat temperature—and sometimes includes qualification data. That's it. Nothing mystical about it. In practice, most people call these documents WPS sheets, though the terminology varies by shop. The difference rarely matters until someone asks you for a copy and you realize your "handbook" is three sticky notes taped to a welding cart. I learned that distinction the hard way when an inspector sent me back two days of work because my procedure documentation didn't reference a qualifying PQR.
What Should Be In Your Procedure Handbook Of Arc Welding
A proper document needs specific fields filled out correctly. The bare minimum includes base metal composition and thickness range, filler metal classification, joint design and preparation, welding position(s) being qualified for, preheat and interpass temperature ranges, heat input calculations, shielding gas composition and flow rate, and post-weld heat treatment requirements if applicable. The thing most people skip is the range on current and voltage. Writing "180 amps" sounds precise but it's actually useless because every joint and fit-up is slightly different. Write a range like 160–200 amps with a note about what to adjust when. That note is worth more than the number itself. I ran into a real issue with aluminum TIG welding where the procedure called for 50% argon and 50% helium mix at 200 CFH flow. The helium was getting swapped out for pure argon by whoever ordered the gas, and nobody noticed because both cylinders looked similar. We ended up with incomplete fusion on 3/8 inch plate because the heat input dropped by roughly 30 percent and nobody checked. I started requiring gas certificates to match each cylinder delivery and posted the supplier part numbers at the station. Changed the problem from invisible to obvious in about five minutes.
How To Build One Without Overthinking It
Start with what you already weld successfully. Most shops have people who can produce good welds without being able to explain why. Watch one of them lay down a test coupon, write down every parameter they use, and then test it on a second piece. If it repeats, you have data. If it doesn't, you have a variable you need to nail down next. The heat input calculation trips people up more than anything else. The formula is straightforward: (amps × volts × 60) / (inches per minute × 1000). That gives you kilojoules per millimeter if you're using metric, or kilojoules per inch in imperial. Most people just estimate or skip it entirely. Don't skip it. Heat input determines grain structure, hardness, and whether you'll crack high-strength low-alloy steel on a cool morning. Here's something most beginners miss: interpass temperature matters more than preheat in multi-pass welds. You can preheat perfectly and then stack passes without controlling the temperature between them, and your procedure becomes meaningless. Keep a IR thermometer at every station. It costs about forty dollars and prevents at least one rework incident per month in a busy shop.
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Common Mistakes That Make Your Handbook Useless
The first one is copying someone else's procedure without understanding the variables. AWS and ASME allow procedure substitution under certain conditions, but only if the base material falls within the same group and the thickness ranges overlap properly. Copying a procedure from a different shop's handbook for structural steel and applying it to pressure vessel work is how people get cited. The second mistake is writing procedures that can't be followed on a real production floor. If your travel speed is listed as "steady" instead of a range in inches per minute, the person welding it will do whatever feels right, which means every weld is different. Write it so a competent welder who hasn't seen the procedure before can follow it and get the same result. There's also the problem of procedures that work perfectly in the lab and fail in the field. Wind protection on outdoor MIG welding is the classic example. Your handbook might specify 30–50 CFH argon/CO2 mix and everything tests fine indoors. Put that same setup outside on a fifteen-mile-an-hour day and you're shooting gas into the breeze. The fix isn't always visible wind shielding—it's sometimes adjusting the flow rate up to 60 CFH and using a flow restrictor rather than just cranking the knob and hoping.
When A Procedure Handbook Won't Save You
No written procedure fixes bad fit-up. If your root gap is inconsistent or your bevel angles vary, no combination of parameters will produce sound welds every time. I've seen people spend hours tweaking amperage and voltage trying to compensate for gaps that should have been addressed before the torch was lit. Get the joint preparation right first. The procedure documents the welding, not the preparation, but you need both to work together. Procedures also don't help much with material that doesn't meet specification. I worked on a project where the mill certificate for one batch of A517 steel showed carbon equivalent running at the upper limit of the spec. Our procedure was solid for normal material, but that batch cracked on the third pass. We had to drop amperage, increase interpass temperature control, and add a pause between passes to let the heat dissipate more evenly. The original procedure couldn't account for material variance because nobody expected it to be that consistent at the top of the range. If you're welding thick sections of quenched and tempered steel without post-weld heat treatment, a standard procedure handbook will only take you so far. You need metallurgical understanding beyond the parameter table. In those cases, consult with a welding engineer or metallurgist rather than trusting a document that was written for carbon steel at half the thickness.
Download And Template Guidance
Most organizations use existing templates rather than building from scratch. AWS provides Form QR-10 for procedure qualification records, and ASME has standard WPS formats in Section IX. Many shops use modified versions of these depending on their code requirements. The American Welding Society publishes sample forms that are widely accepted across industries. For smaller operations that don't need full code compliance, a simpler format works fine. A spreadsheet with the key parameters, material specifications, and a section for notes on adjustments made during testing covers most shop-floor needs. The goal isn't to match a template exactly. The goal is documentation that any welder in your shop can read and follow without needing someone to translate it first. I keep a current version of my procedure handbook in a binder at each welding station, not on a shelf somewhere. Updated procedures that nobody can find when they need them are worse than no procedure at all. If a welder has to leave the station to look up parameters, they'll guess, and guessing is how you get bad welds repeated across an entire batch.
