Weld Testing

Welder Qualification and Welding Procedure Qualification

wet-fluorescent-magnetic-particle-testingLaboratory Testing Inc. offers independent, third-party weld testing and welder qualification services for welder certification and welding procedure qualification. Testing is performed per MIL & API specifications, ASME & AWS codes, ASTM & EN standards and the Pressure Equipment Directive.

All required services are available to verify and certify:

  • Weld procedure was followed properly
  • Correct filler material was used
  • Weld joint is aligned accurately

Laboratory Testing is a full-service weld test and welder qualification provider with complete in-house resources to turn your order around quickly and reliably. LTI is located in the Philadelphia, PA (USA) area.

Scope of Capabilities

  • Welder Qualification Testing for performance qualification and welder certification
  • Preparation of Welding Procedure Qualification as per client or project requirements
  • Documentation of the Welding Procedure Qualification in a Certified Test Report
  • Coupon Testing as per Welding Procedure Qualification which includes visual examination, mechanical testing, metallographic examination and nondestructive testing

LTI’s staff includes chemists, engineers and certified NDT inspectors, including Level II inspectors in NDT Visual Inspection. The full-service Machine Shop can prepare any size weld coupon, and runs two work shifts to process orders under tight deadlines.

Weld Testing Methods for Welding Qualifications

Metallurgical Testing

  • Materials testing Macro-etchMacroetch
  • Vickers Hardness Testing
  • Ferrite Exam –Point Count and Feritscope

Chemical Analysis

  • Dilution Analysis
  • Inductively-Coupled Plasma Spectroscopy (ICP)
  • Atomic Emission Spectroscopy (AES)

Corrosion Testing

Mechanical Testing

  • Tensile Testing
  • Guided-Bend Tests – Plunger Type and Wrap Around Bends
  • Charpy Impact Testing
  • Drop Weight Testing
  • Nick Break Tests
  • Push Out Tests
  • Peel Tests
  • Vickers micro hardness testSection Tests
  • Hardness Testing
  • Fracture Toughness

Nondestructive Testing

  • Visual Examination
  • X-ray/Radiographic Inspection
  • Magnetic Particle Inspection
  • Liquid Penetrant Testing
  • Ultrasonic Testing (flat welds)

Weld Test Processes

Many types of testing are performed on welds and meet industry standards for welder qualification and welding procedure qualification, including these below:

Macroetch Exam

The macroetch exam is typically performed on a finely ground cross-section taken transverse to the weld axis that has been etched with a chemical reagent to distinguish the weld, heat affected zone (HAZ), and base metal areas. Examination for characteristics such as weld size, fusion, penetration, profile, and weld discontinuities is performed at magnifications anywhere between 1X and 50X. Various AWS, ASME, military, and customer specifications call for macroetch examination.

Hardness Testing

The weld test for hardness evaluates the strength of the weld and is performed on a ground and etched sample, similar to the macroetch specimen. The most commonly employed scale for weld testing at LTI is the 10 Kg Vickers. This generally involves checking the hardness in all three zones, including weld , HAZ and base according to a pattern prescribed by the referenced specification. Hardness testing of welds is an extremely common practice and requirement in the oil and gas industry. One of the most commonly encountered specifications being NACE MR0175 / ISO 15156, and or a company-specific derivation.

Ferite Examination

Ferrite examination by the point count method and feritscope are performed to determine the amount of ferrite present in the weld metal, HAZ and/or base metal. The point count test is performed on a polished and etched cross-section of the sample per the point count method described in ASTM E562 or a company-specific derivation. The point count test is typically applied only to welds that involve the duplex stainless steels. Ferrite examination by feritscope is a nondestructive test performed with a contact probe that calculates ferrite via electro-magnetic response. This test is typically applied to welds that involve the austenitic steels.


LTI’s Chemistry Lab analyzes weld overlays as well as raw materials using various methods that include dilution analysis for overlays and Inductively-Coupled Plasma Spectroscopy (ICP) and Atomic Emission Spectroscopy (AES) for raw materials. The weld dilution test is used in weld qualification and involves dilution of the weld metal by the base metal following procedures to perform the test at specific distances from the base metal. The weld metal analysis is usually performed to AWS or ASME Part C specifications.

Nondestructive and Mechanical Testing

LTI offers Liquid Penetrant, Magnetic Particle, Visual Inspection, Ultrasonic Testing and Radiographic Inspection for non destructive evaluation. These tests are usually done in conjunction with applicable mechanical testing such as tensile, bend or impact testing according to the same specifications.

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Customer Testimonials

“Thank you for your prompt service and the personalized pick-up and delivery. I have inspected the samples provided and am impressed with the quality of work. I’m sure my customer will be pleased as well. I look forward to working with LTI in the future.”

Keith Donald
Fracture Technology Associates


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