Exhibit 3.1

FIFTH AMENDED AND RESTATED CERTIFICATE OF INCORPORATION

OF

THERMADYNE HOLDINGS CORPORATION

The original Certificate of Incorporation of Palco Acquisition Corp. (the “Corporation”) was filed with the Secretary of State of Delaware on August 7, 1987. This Amended and Restated Certificate of Incorporation has been duly adopted by the Corporation in accordance with Sections 242 and 245 of the General Corporation Law of the State of Delaware (the “DGCL”). The text of the Certificate of Incorporation is amended and restated (the “Certificate of Incorporation”) in its entirety to read as follows:

FIRST: The name of the Corporation is: Victor Technologies Group, Inc.

SECOND: The address of the registered office of the Corporation in the State of Delaware is 160 Greentree Drive, Suite 101, Dover, Kent County, Delaware 19904. The name of the registered agent of the Corporation at such address is National Registered Agents, Inc.

THIRD: The purpose of the Corporation is to engage in any lawful act or activity for which corporations may be organized under the DGCL, as from time to time amended.

FOURTH: The total number of shares of capital stock which the Corporation shall have authority to issue is 1,000 shares of common stock, par value $0.01 per share. Except as otherwise provided by law, the shares of stock of the Corporation may be issued by the Corporation from time to time in such amounts, for such consideration and for such corporate purposes as the board of directors of the Corporation (the “Board of Directors”) may from time to time determine.

FIFTH: The number of directors of the Corporation shall be fixed from time to time by the by-laws or amendment thereof adopted by the Board of Directors. Election of directors need not be by written ballot.

SIXTH: In furtherance and not in limitation of the powers conferred by law, subject to any limitations contained elsewhere in these articles of incorporation, by-laws of the Corporation may be adopted, amended or repealed by a majority of the Board of Directors of the Corporation, but any by-laws adopted by the Board of Directors may be amended or repealed by the stockholders entitled to vote thereon.

SEVENTH: A director of the Corporation shall not be personally liable to the Corporation or its stockholders for monetary damages for breach of fiduciary duty as a director, except for liability (i) for any breach of the director’s duty of loyalty to the Corporation or its stockholders, (ii) for acts or omissions not in good faith or which involve intentional misconduct or knowing violation of law, (iii) under Section 174 of the DGCL, or (iv) for any transaction from which the director derived an improper personal benefit. Any repeal or amendment of this Article SEVENTH by the stockholders of the Corporation shall be prospective only, and shall not adversely affect any limitation on the personal liability of a director of the Corporation arising from an act or omission occurring prior to the time of such repeal or amendment. In

addition to the circumstances in which a director of the Corporation is not personally liable as set forth in the foregoing provisions of this Article SEVENTH, a director shall not be liable to the Corporation or its stockholders to such further extent as permitted by any law hereafter enacted, including without limitation any subsequent amendment to the DGCL. EIGHTH: The Corporation shall indemnify any person who was, is, or is threatened to be made a party to a proceeding (as hereinafter defined) by reason of the fact that he or she (i) is or was a director or officer of the Corporation or (ii) while a director or officer of the Corporation, is or was serving at the request of the Corporation as a director, officer, partner, venturer, proprietor, trustee, employee, agent, or similar functionary of another foreign or domestic corporation, partnership, joint venture, sole proprietorship, trust, employee benefit plan, or other enterprise, to the fullest extent permitted under the DGCL, as the same exists or may hereafter be amended. Such right shall be a contract right and as such shall run to the benefit of any director or officer who is elected and accepts the position of director or officer of the Corporation or elects to continue to serve as a director or officer of the Corporation while this Article EIGHTH is in effect. Any repeal or amendment of this Article EIGHTH shall be prospective only and shall not limit the rights of any such director or officer or the obligations of the Corporation with respect to any claim arising from or related to the services of such director or officer in any of the foregoing capacities prior to any such repeal or amendment to this Article EIGHTH. Such right shall include the right to be paid by the Corporation expenses incurred in defending any such proceeding in advance of its final disposition to the maximum extent permitted under the DGCL, as the same exists or may hereafter be amended. If a claim for indemnification or advancement of expenses hereunder is not paid in full by the Corporation within 60 days after a written claim has been received by the Corporation, the claimant may at any time thereafter bring suit against the Corporation to recover the unpaid amount of the claim, and if successful in whole or in part, the claimant shall also be entitled to be paid the expenses of prosecuting such claim. It shall be a defense to any such action that such indemnification or advancement of costs of defense are not permitted under the DGCL, but the burden of proving such defense shall be on the Corporation. Neither the failure of the Corporation (including its board of directors or any committee thereof, independent legal counsel, or stockholders) to have made its determination prior to the commencement of such action that indemnification of, or advancement of costs of defense to, the claimant is permissible in the circumstances nor an actual determination by the Corporation (including its board of directors or any committee thereof, independent legal counsel, or stockholders) that such indemnification or advancement is not permissible shall be a defense to the action or create a presumption that such indemnification or advancement is not permissible. In the event of the death of any person having a right of indemnification under the foregoing provisions, such right shall inure to the benefit of his or her heirs, executors, administrators, and personal representatives. The rights conferred above shall not be exclusive of any other right which any person may have or hereafter acquire under any statute, by-law, resolution of stockholders or directors, agreement, or otherwise.

The Corporation may additionally indemnify any employee or agent of the Corporation to the fullest extent permitted by law.

As used herein, the term “proceeding” means any threatened, pending, or completed action, suit, or proceeding, whether civil, criminal, administrative, arbitrative, or investigative, any appeal in such an action, suit, or proceeding, and any inquiry or investigation that could lead to such an action, suit, or proceeding.

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NINTH: The Corporation expressly elects not to be governed by Section 203 of the DGCL.

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IN WITNESS WHEREOF, the undersigned has duly executed this Amended and Restated Certificate of Incorporation on this 21st day of May 2012.

SIGNATURE PAGE TO VICTOR TECHNOLOGIES GROUP, INC. AMENDED AND RESTATED CERTIFICATE OF INCORPORATION