What Is a Pipe Welder? Career Guide

A pipe welder welds pipe: joining, building out, and repairing the welded metal piping behind process, mechanical, and high-pressure systems.

In the federal data the title lives inside one occupation.

O*NET merged the old Plumbers code and the old Pipe Fitters and Steamfitters code into a single occupation — 47-2152.00 Plumbers, Pipefitters, and Steamfitters — and the old separate codes are no longer in use.

Pipe Welder appears in that occupation's sample of reported job titles, alongside Pipefitter, Plumber, Drain Technician, and Fire Sprinkler Service Technician.

Inside the trade, the role sits at the welding end of the work BLS describes for pipefitters and steamfitters: installing and maintaining pipes that may carry chemicals, acids, and gases, mostly in manufacturing, commercial, and industrial settings, with steamfitters specializing in systems for liquids or gases at high pressure.

The United Association (UA), the piping trades' union, describes that high-pressure work as fabricating, installing, maintaining, and repairing systems that move steam, hot water, and other industrial fluids — with welding, rigging, and hydrostatic and pneumatic testing among the tasks.

The pipe welder is the crew member who makes the welded joints the rest of that system depends on.

The boundary with other titles in the occupation is one of emphasis, not a wall.

BLS describes plumbers as installing and repairing water, gas, and other piping systems in homes, businesses, and factories, including fixtures such as bathtubs and toilets — the fixture-and-service end of the combined occupation, covered in our plumber career guide.

Pipe welding is the metal-piping end.

And because fitting and welding skills overlap heavily, some workers hold both skill sets and work as pipefitter-welder hybrids — the combination role has its own guide in this cluster.

For the wider fitting trade the pipe welder works inside, see our pipefitter career guide.

The certification most pipe-welding job posts ask about is a 6G.

Industry and training sources describe the 6G test as a weld made on pipe fixed at a 45-degree incline and not rotated — the welder has to work the joint through every angle rather than turning the pipe to a comfortable position.

Those same secondary sources say that under ASME Section IX, a 6G groove-weld qualification generally qualifies the welder for all positions.

Read that with care: the qualification rules live in ASME's Boiler and Pressure Vessel Code, Section IX, which is paywalled, so confirm position and qualification ranges against the code or with the test facility before you rely on them.

Our research did not confirm a single national pipe-welder certificate.

The qualification the sources we reviewed describe runs through weld tests under a welding code — ASME Section IX for the 6G range claim above — and some cities add a licence on top: the New York City Department of Buildings lists Welder among its skilled-trade licences, so in NYC the title is a municipal licence rather than only a shop qualification.

"Combo pipe welder" is a common listing term, and it is the one we cannot standardize for you: our research did not confirm a single national definition behind the combo label.

Before you schedule a test, ask the employer or test facility exactly what their combo requirement covers — which welding processes, which test positions, and which code — and get the answer in writing.

The employment data put numbers on those manufacturing, commercial, and industrial settings.

In 2025, 65% of plumber, pipefitter, and steamfitter jobs were with plumbing, heating, and air-conditioning contractors and 8% were self-employed (BLS, 510,600 total jobs including self-employed).

In the May 2025 OEWS industry counts, building equipment contractors employed 340,140 of the occupation's workers, ahead of utility system construction at 14,960 and local government, excluding schools and hospitals, at 11,480.

Median annual wages by top industry ran from government at $71,660 and manufacturing at $65,770 to heavy and civil engineering construction at $63,270 and plumbing, heating, and air-conditioning contractors at $63,010.

The second benchmark shows where welding jobs sit when they are not in the pipe trades.

The largest employers of Welders, Cutters, Solderers, and Brazers (SOC 51-4121) are in manufacturing: fabricated metal product manufacturing (70,020 jobs across two subgroups BLS counts separately) and machinery manufacturing (56,750).

That occupation's jobs concentrate in Texas (52,000), California (26,060), Ohio (20,330), Pennsylvania (17,850), and Florida (16,420), while the combined pipe trades concentrate in California (47,660), Texas (44,090), Florida (29,260), New York (23,210), and Illinois (16,750).

The working pattern is full-time heavy.

BLS says most plumbers, pipefitters, and steamfitters work full time, including nights and weekends, with plumbers often on call for emergencies.

Union coverage shapes part of the trade: the UA says it represents approximately 409,000 plumbers, pipefitters, sprinkler fitters, HVACR service technicians, welders, and related trades across North America — a count that includes Canada — and it lists welders among its trades.

BLS publishes union membership only for broad occupation groups — 16.4% of construction and extraction workers and 12.5% of installation, maintenance, and repair workers were union members in 2025 — and no membership rate or pay premium specific to pipe welders exists in the federal data.

Most people learn this trade inside a registered apprenticeship.

BLS says most plumbers, pipefitters, and steamfitters learn through a 4- or 5-year apprenticeship with typically 2,000 hours of paid on-the-job training plus technical instruction each year; programs are sponsored by unions, trade associations, and businesses.

The steps below follow that route, with the welding-specific checkpoints called out.

Apprentice pay follows federal rules with local detail.

Registered apprenticeship programs must use a progressively increasing schedule of wages, starting at no less than the applicable minimum wage — but federal rules do not set apprentice pay as a fixed percentage of the journeyworker rate; those percentage steps come from each program's standards or a collective bargaining agreement.

Apprentices earn less than fully trained welders and fitters, and their pay increases as they learn to do more.

There is no pipe-welder-only number in the federal data, so a pipe welder's pay benchmark depends on which side of the trade the job sits.

Both benchmarks below are medians from the BLS Occupational Employment and Wage Statistics survey (OEWS, May 2025, released May 15, 2026), and each covers a broader category — named as such.

Neither row is a pipe-welder wage.

SOC 51-4121 covers welders across all industries, with the largest employment in fabrication manufacturing, and SOC 47-2152 covers the whole combined pipe-trades occupation.

The percentiles show each category's range: for welders, the 10th percentile was $18.87 an hour ($39,240 a year) and the 90th was $37.28 ($77,530); for the pipe trades, the 75th percentile was $40.92 ($85,110) and the 90th was $52.13 ($108,420) — meaning at least 10% of the combined occupation earned more than $108,420 a year.

The outlooks differ the same way: welders overall are projected to grow 2.4% from 2025 to 2035 with about 40,300 openings a year, while the combined pipe trades are projected to grow 6.8% with about 42,000 openings a year — against a 3.5% average for all occupations.

State-by-state and metro tables for both benchmarks live on our pipe welder salary page — the same caveat applies there: compare figures with the same basis only, because neither survey line isolates pipe welders.

This guide is career information, not legal or licensing advice. Weld-test and licensing requirements vary by employer, welding code, and city — confirm anything you rely on with the employer, the apprenticeship sponsor, or your local building department.